JP7489994B2 - Method and apparatus for grant-free data transmission in a wireless communication system - Google Patents

Description

The present disclosure relates to a wireless communication system. Specifically, the present disclosure relates to a method and apparatus for transmitting data on a grant-free basis in a wireless communication system.

Efforts are underway to develop improved 5G or pre-5G communication systems to meet the increasing demand for wireless data traffic since the commercialization of 4G communication systems. For this reason, 5G or pre-5G communication systems are referred to as Beyond 4G Network communication systems or Post LTE systems.

To achieve high data transmission rates, 5G communication systems are being considered for implementation in ultra-high frequency (mmWave) bands (such as the 60 GHz band). To mitigate radio wave propagation losses and increase transmission distances in ultra-high frequency bands, beamforming, massive array multiple input/output (MIMO), full dimensional multiple input/output (FD-MIMO), array antenna, analog beamforming, and large scale antenna technologies are being discussed for 5G communication systems.

In addition, to improve the system network, the 5G communication system will use advanced small cells,
Technologies under development include improved small cells, cloud radio access networks (cloud RANs), ultra-dense networks, device to device communication (D2D), wireless backhaul, moving networks, cooperative communication, Coordinated Multi-Points (CoMP), and interference cancellation. In addition, in the 5G system, advanced coding modulation (ACM) methods such as FQAM (Hybrid FSK and QAM Modulation) and SWSC (Sliding Window Superposition Coding), as well as advanced connection technologies such as FBMC (Filter Bank Multi Carrier), NOMA (non-orthogonal multiple access), and SCMA (sparse code multiple access) are being developed.

Meanwhile, the Internet is evolving from a human-centered connection network where humans generate and consume information to an IoT (Internet of Things) network that exchanges and processes information between distributed components such as things. IoE (Internet of Everything) technology is also emerging, combining big data processing technology through connection to cloud servers with IoT technology. To realize IoT, technological elements such as sensing technology, wired and wireless communication and network infrastructure, service interface technology, and security technology are required, and recently technologies such as sensor networks for connecting things, machine to machine (M2M), and machine type communication (MTC) are being researched. In an IoT environment, intelligent IT (Internet Technology) services can be provided that collect and analyze data generated by connected things to create new value in human life. IoT can be applied to fields such as smart homes, smart buildings, smart cities, smart cars or connected cars, smart grids, healthcare, smart home appliances, and advanced medical services through the convergence and integration of existing IT (information technology) technologies and various industries.

As a result, various attempts are being made to apply 5G communication systems to IoT networks. For example, technologies such as sensor networks, machine to machine (M2M), and machine type communication (MTC) are being embodied in 5G communication technologies using techniques such as beamforming, MIMO, and array antennas. The application of cloud radio access network (cloud RAN) as the big data processing technology mentioned above is also an example of the convergence between 5G technology and IoT technology.

The 5G communication system is evolving to provide a variety of services, and as such, there is a demand for methods to provide these services efficiently. As a result, research into grant-free based communications is being actively conducted.

The foregoing information is presented as background information to aid in understanding the contents of this disclosure. No determination or assertion has been made as to whether any of the foregoing is applicable as prior art to the present disclosure.

Recently, there has been a demand for improving grant-free data transmission and reception in 5G wireless communication systems.

Aspects of the present disclosure address at least the problems and/or drawbacks mentioned above and provide at least the advantages described below. Thus, according to one aspect of the present disclosure, an embodiment for performing grant-free based data transmission and reception using radio resources efficiently is described. In particular, a downlink grant-free based data transmission and reception method and an uplink grant-free based data transmission and reception method are described.

Additional aspects are described in part in the following description, and may be apparent from the description, or may be learned by practice of the embodiments provided.

According to one aspect of the present disclosure, a method performed by a terminal is provided. The method includes receiving a downlink control information (DCI) from a base station instructing the release of a plurality of semi persistent scheduling (SPS) physical downlink shared channel (PDSCH), acquiring a HARQ-ACK codebook including hybrid automatic repeat request acknowledgment (HARQ-ACK) information bits corresponding to the DCI, and transmitting the HARQ-ACK codebook to the base station, where the position of the HARQ-ACK information bit corresponding to the DCI in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS index among the plurality of SPS PDSCH releases.

According to another aspect of the present disclosure, a method performed by a base station is provided. The method includes transmitting a DCI (downlink control information) instructing a terminal to release a plurality of SPS (semi persistent scheduling) PDSCHs (physical downlink shared channel), and receiving a HARQ-ACK codebook including a HARQ-ACK (hybrid automatic repeat request acknowledgment) information bit corresponding to the DCI from the terminal, and the position of the HARQ-ACK information bit corresponding to the DCI in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS index among the plurality of SPS PDSCH releases.

According to yet another aspect of the present disclosure, a terminal is provided. Such a terminal includes a transceiver configured to transmit and receive signals, and a control unit, and the control unit is configured to receive downlink control information (DCI) from a base station instructing the release of multiple SPS (semi persistent scheduling) PDSCHs (physical downlink shared channels), obtain a HARQ-ACK codebook including hybrid automatic repeat request acknowledgment (HARQ-ACK) information bits corresponding to the DCI, and transmit the HARQ-ACK codebook to the base station, and the position of the HARQ-ACK information bit corresponding to the DCI in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS index among the multiple SPS PDSCH releases.

According to another aspect of the present disclosure, a base station is provided. The base station includes a transceiver configured to transmit and receive signals, and a controller configured to transmit a DCI (downlink control information) instructing a terminal to release a plurality of SPS (semi persistent scheduling) PDSCHs (physical downlink shared channel), and receive a HARQ-ACK codebook including a HARQ-ACK (hybrid automatic repeat request acknowledgment) information bit corresponding to the DCI from the terminal, and the position of the HARQ-ACK information bit corresponding to the DCI in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS index among the plurality of SPS PDSCH releases.

Other aspects, advantages and salient features of the present disclosure will become apparent to those skilled in the art from the following detailed description, which, taken in conjunction with the accompanying drawings, discloses various embodiments of the present disclosure.

According to the disclosed embodiment, radio resources can be used efficiently and various services can be efficiently provided to users according to priority.

The above and other aspects, features and advantages of particular embodiments of the present disclosure will become more apparent from the following description taken in conjunction with the accompanying drawings.

A diagram showing a transmission structure of the time-frequency domain, which is a radio resource domain of a 5G or NR system according to an embodiment of the present disclosure. A diagram showing an example of allocating data for eMBB, URLLC, and mMTC in a time-frequency resource region in a 5G or NR system according to an embodiment of the present disclosure. 1 is a diagram illustrating a grant-free transmission and reception operation according to an embodiment of the present disclosure. 1 is a diagram showing a method of setting a semi-static hybrid automatic repeat request (HARQ)-acknowledgement (ACK) codebook in an NR system. 1 is a diagram showing a method for setting a dynamic HARQ-ACK codebook in an NR system. 1 is a diagram showing a HARQ-ACK transmission process for DL SPS. 1 is a block diagram illustrating a process in which a UE transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for downlink control information (DCI) indicating deactivation of a semi-persistent scheduling (SPS) physical downlink shared channel (PDSCH). A block diagram showing a method for a terminal to determine a dynamic HARQ-ACK codebook for receiving an SPS PDSCH. A block diagram showing a method of transmitting HARQ-ACK information based on a terminal's DL (downlink) SPS transmission period. A block diagram showing a terminal operation for dynamically changing a DL SPS transmission period. 1 is a diagram showing a method of transmitting HARQ-ACK information for an SPS release of a terminal when two or more DL SPSs are activated. 1 is a diagram illustrating a grant-free operation in a situation where a terminal is connected to two or more transmission and reception points (TRPs). FIG. 2 is a block diagram illustrating the structure of a terminal capable of implementing an embodiment of the present disclosure. FIG. 2 is a block diagram illustrating the structure of a base station capable of implementing embodiments of the present disclosure.

Throughout the drawings, like reference numbers will be understood to refer to like parts, components and structures.

The following description, which refers to the accompanying drawings, is provided to facilitate a comprehensive understanding of the various embodiments of the present disclosure as defined by the claims and their equivalents. Although various specific details are included to facilitate such understanding, they should be considered as merely illustrative. Accordingly, those skilled in the art will recognize that various changes and modifications of the various embodiments described herein can be made without departing from the scope and spirit of the present disclosure. Furthermore, descriptions of well-known functions and configurations may be omitted for clarity and conciseness.

The terms and words used in the following description and claims are not limited to their dictionary meanings, but are merely used by the inventors to provide a clear and consistent understanding of the contents of the present disclosure. Therefore, it will be apparent to those skilled in the art that the following description of various embodiments of the present disclosure is provided for illustrative purposes only, and not for the purpose of limiting the disclosure as defined by the appended claims and equivalents thereof.

The singular forms "a," "an," and "the" should be understood to include plural referents unless the context clearly dictates otherwise. Thus, for example, reference to a "component surface" includes reference to one or more of such surfaces.

When describing the embodiments, technical content that is well known in the technical field to which this disclosure pertains and is not directly related to this disclosure will be omitted. This is to clarify and more clearly convey the gist of this disclosure by omitting unnecessary explanations.

For the same reason, some components are exaggerated, omitted or illustrated diagrammatically in the accompanying drawings. Also, the size of each component does not entirely reflect the actual size. The same or corresponding components in each drawing are given the same reference numerals.

Advantages and features of the present disclosure, and methods for achieving the same, will become apparent from the following detailed description of the embodiments in conjunction with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be embodied in various different forms, and the embodiments are provided only to complete the disclosure and to fully inform those skilled in the art of the present disclosure of the scope of the disclosure, and the present disclosure is defined only by the scope of the claims. The same reference numerals refer to the same elements throughout the specification.

It will be understood that the combination of each block of the process flow chart and the diagrams of the flow chart can be implemented by computer program instructions. These computer program instructions can be loaded into a processor of a general purpose computer, a special purpose computer, or other programmable data processing equipment, such that the instructions executed by the processor of the computer or other programmable data processing equipment generate means for performing the functions described in the flow chart blocks. These computer program instructions can also be stored in a computer usable or computer readable memory that can direct the computer or other programmable data processing equipment to implement the functions in a specific manner, such that the instructions stored in the computer usable or computer readable memory can produce an article of manufacture that includes instruction means for performing the functions described in the flow chart blocks. The computer program instructions can also be loaded onto a computer or other programmable data processing equipment, such that a sequence of operational steps is performed on the computer or other programmable data processing equipment to generate a computer-implemented process, such that the instructions for the computer or other programmable data processing equipment provide operations for performing the functions described in the flow chart blocks.

Also, each block may represent a module, segment, or portion of code that includes one or more executable instructions for performing a specified logical function. It should also be noted that in some alternative implementations, the functions noted in the blocks may occur out of order. For example, two blocks shown adjacent to each other may in fact be performed substantially simultaneously, or the blocks may sometimes be performed in reverse order depending on the functionality involved.

In this embodiment, the term 'module' refers to software or hardware components such as FPGA (Field Programmable Gate Array) or ASIC (Application Specific Integrated Circuit), and the 'module' performs a specific function. However, the 'module' is not limited to software or hardware. The 'module' may be configured to reside in an addressable storage medium, or to execute one or more processors. Thus, as an example, the 'module' includes components such as software components, object-oriented software components, class components, and task components, as well as processes, functions, attributes, procedures, subroutines, program code segments, drivers, firmware, microcode, circuits, data, databases, data structures, tables, arrays, and variables. The components and functions provided in the 'module' may be combined into a smaller number of components and 'modules' or further separated into additional components and 'modules'. In addition, the components and '~ units' may be implemented to implement one or more CPUs within a device or a secure multimedia card. In addition, in some embodiments, the '~ units' may include one or more processors.

Wireless communication systems have moved beyond providing voice-based services in the early days and are evolving into broadband wireless communication systems that provide high-speed, high-quality packaged data services, such as 3GPP's HSPA (High Speed Packet Access), LTE (Long Term Evolution or E-UTRA (Evolved Universal Terrestrial Radio Access), LTE-Advanced (LTE-A), 3GPP2's HRPD (High Rate Packet Data), UMB (Ultra Mobile Broadband), and IEEE's 802.16e. In addition, 5G or NR (New Radio) communication standards are being developed for fifth-generation cordless communication systems.

In the 5G or NR system, which is a representative example of a broadband wireless communication system, the downlink (DL) and uplink (UL) adopt the Orthogonal Frequency Division Multiplexing (OFDM) method. More specifically, the downlink adopts the Cyclic-Prefix OFDM (CP-OFDM) method, and the uplink adopts the Discrete Fourier Transform Spreading OFDM (DFT-S-OFDM) method together with the CP-OFDM. The uplink refers to a wireless link in which a terminal transmits data or control signals to a base station, and the downlink refers to a wireless link in which a base station transmits data or control signals to a terminal. This multiple access method allows each user's data or control information to be separated by allocating and manipulating time-frequency resources that transmit data or control information for each user so that they do not overlap, i.e., so that orthogonality is established.

5G or NR systems employ a Hybrid Automatic Repeat reQuest (HARQ) method that retransmits data in the physical layer if a decoding failure occurs during initial transmission. In the HARQ method, if the receiver cannot correctly decode data, the receiver transmits information (Negative Acknowledgement, NACK) to the transmitter notifying the transmitter of the decoding failure, and the transmitter can retransmit the data in the physical layer. The receiver combines the data retransmitted by the transmitter with data that was previously unsuccessfully decoded to improve data reception performance. In addition, if the receiver correctly decodes data, the receiver transmits information (ACK) to the transmitter notifying the transmitter of successful decoding, allowing the transmitter to transmit new data.

Meanwhile, the new 5G communication NR system is designed to allow various services to be freely multiplexed in time and frequency resources, and thus waveforms, numerology, and reference signals can be dynamically or freely allocated according to the needs of the service. Meanwhile, in the 5G or NR system, the types of services supported can be categorized into eMBB (Enhanced Mobile Broadband), mMTC (massive Machine Type Communications), URLLC (Ultra-Reliable and Low-Latency Communications), etc. eMBB is a service that aims for high-speed transmission of high-volume data, mMTC is a service that aims for minimizing terminal power and connecting multiple terminals, and URLLC is a service that aims for high reliability and low latency. Different requirements may apply depending on the type of service applied to the terminal.

In this disclosure, each term is defined in consideration of its function, and may vary depending on the intention or practice of a user or operator. Therefore, the definition should be based on the entire contents of this specification. Hereinafter, a base station is a subject that allocates resources to a terminal, and may be at least one of a gNode B (gNB), an eNode B (eNB), a Node B, a BS (Base Station), a radio access unit, a base station controller, or a node on a network. A terminal may include a UE (User Equipment), an MS (Mobile Station), a cellular phone, a smartphone, a computer, or a multimedia system capable of performing a communication function. Hereinafter, this disclosure will be described using an NR system as an example, but is not limited thereto, and the embodiments of the present disclosure may be applied to various communication systems having similar technical backgrounds or channel forms. Furthermore, the embodiments of the present disclosure may be applied to other communication systems through partial modifications within the scope of the present disclosure, as determined by a person with skilled technical knowledge.

In this disclosure, the terms physical channel and signal in the related art may be used interchangeably with data or control signal. For example, PDSCH is a physical channel through which data is transmitted, but in this disclosure, PDSCH may also be data. That is, PDSCH transmission and reception may be understood as data transmission and reception.

In this disclosure, higher level signaling (or higher level signal, higher layer signal, or higher layer signaling) refers to a signaling method in which a base station transmits a signal to a terminal using a downlink data channel of the physical layer, or a terminal transmits a signal to a base station using an uplink data channel of the physical layer, and may also be referred to as RRC (radio resource control) signaling or MAC (medium access control) control element (CE).

In recent years, as research into 5G communication systems has progressed, various methods for scheduling communication with terminals have been discussed. As a result, efficient scheduling and data transmission/reception methods that take into account the characteristics of 5G communication systems are required. As a result, in order to provide multiple services to users in a communication system, a method that can provide each service within the same time period in accordance with the characteristics of the service and an apparatus using the same are required.

A terminal must receive separate control information from a base station to transmit or receive data at the base station. However, in the case of periodically generated traffic or a service type that requires low latency and/or high reliability, data can be transmitted or received without the separate control information. In this disclosure, such a transmission method is called a configured grant (which may be mixed with configured grant, grant-free, or configured scheduling) based data transmission method. A method of receiving or transmitting data after receiving data transmission resource settings and related information configured through control information is referred to as a first signal transmission/reception type, and a method of transmitting or receiving data based on pre-configured information without control information is referred to as a second signal transmission/reception type. For the second signal transmission/reception type, a pre-defined resource region is periodically present, and this region is set only in the upper signal, i.e., the uplink type 1 grant (UL type 1 grant), and the uplink type 2 grant (UL type 2 grant) (or semi-persistent scheduling, SPS), which is set by a combination of the upper signal and the L1 signal (i.e., downlink control information (DCI)). In the case of the UL type 2 grant (or SPS), some information is the upper signal, and whether or not to transmit the actual data other than that is determined by the L1 signal. Here, the L1 signal can be broadly divided into a signal that instructs the activation of resources set in the upper and a signal that instructs the release of the activated resource.

The present disclosure includes a method for determining a semi-static HARQ-ACK codebook and a dynamic HARQ-ACK codebook, and a method for transmitting HARQ-ACK information, when the DL SPS transmission period is aperiodic or smaller than a slot.

Figure 1 shows the transmission structure of the time-frequency domain, which is the radio resource domain of a 5G or NR system.

Referring to FIG. 1, in the radio resource region, the horizontal axis indicates the time domain and the vertical axis indicates the frequency domain. The minimum transmission unit in the time domain is an OFDM symbol, and N _symb OFDM symbols (102) are collected to form one slot 106. The length of a subframe may be defined as 1.0 ms, and a radio frame (114) may be defined as 10 ms. The minimum transmission unit in the frequency domain is a subcarrier, and the bandwidth of the entire system transmission bandwidth may be composed of a total of N _BW subcarriers 104. However, these specific values may be variably applied depending on the system.

A basic unit of a time-frequency resource region may be represented by an OFDM symbol index and a subcarrier index as a resource element (RE, 112). A resource block (RB, 108) may be defined as N _RB consecutive subcarriers 110 in the frequency domain.

Generally, the minimum transmission unit of data is the RB unit. In a 5G or NR system, N _symb = 14, NRB = 12, and N _BW may be proportional to the bandwidth of the system transmission band. The data rate increases in proportion to the number of RBs scheduled to the terminal. In a 5G or NR system, in the case of an FDD system in which the downlink and the uplink are operated by dividing them by frequency, the downlink transmission bandwidth and the uplink transmission bandwidth may be different from each other. The channel bandwidth indicates the RF bandwidth corresponding to the system transmission bandwidth. Table 1 below shows the correspondence between the system transmission bandwidth and the channel bandwidth defined in the LTE system, which is the fourth generation wireless communication before the 5G or NR system. For example, an LTE system having a 10 MHz channel bandwidth has a transmission bandwidth of 50 RBs.

In a 5G or NR system, a channel bandwidth wider than the LTE channel bandwidth presented in Table 1 can be adopted. Table 2 shows the correspondence between the system transmission bandwidth, channel bandwidth, and subcarrier spacing (SCS) in a 5G or NR system.

In a 5G or NR system, scheduling information for downlink data or uplink data is transmitted from a base station to a terminal via downlink control information (DCI). DCI is defined by various formats, and each format can indicate whether the DCI is scheduling information for uplink data (UL grant) or scheduling information for downlink data (DL grant), whether the DCI is a compact DCI with a small control information size, whether spatial multiplexing using multiple antennas is applied, whether the DCI is for power control, etc. For example, DCI format 1_1, which is scheduling control information for downlink data (DL grant), can include at least one of the following control information.
- Carrier indicator: indicates what frequency carrier is being transmitted on.
- DCI format indicator: An indicator that distinguishes whether the DCI is for downlink or uplink.
- BandWidth Part (BWP) indicator: indicates what BWP is being transmitted.
Frequency domain resource allocation: indicates the frequency domain RBs allocated for data transmission. The resources to be represented are determined according to the system bandwidth and the resource allocation scheme.
- Time domain resource allocation: indicates in which OFDM symbols of which slots data-related channels are transmitted.
- VRB-to-PRB mapping: indicates how to map a virtual RB (VRB) index and a physical RB (PRB) index.
- Modulation and coding scheme (MCS): indicates the modulation scheme and coding rate used for data transmission, i.e., indicates a coding rate value that can notify information on whether the modulation scheme is QPSK (Quadrature Phase Shift Keying), 16QAM (Quadrature Amplitude Modulation), 64QAM, or 256QAM, as well as TBS (Transport Block Size) and channel coding information.
- CBG transmission information: indicates information on which CBG is transmitted when CBG retransmission is set.
- HARQ process number: indicates the HARQ process number.
- New data indicator: indicates whether it is a HARQ initial transmission or a retransmission.
- Redundancy version: Indicates the redundancy version of HARQ.
- PUCCH (Physical Uplink Control Channel) resource indicator: indicates a PUCCH resource for transmitting ACK/NACK information for downlink data.
- PDSCH-to-HARQ feedback timing indicator: indicates the slot in which ACK/NACK information for downlink data is transmitted.
-Transmit Power Control (TPC) command for PUCCH: indicates a transmit power control command for the PUCCH, which is an uplink control channel.

In the case of PUSCH (physical uplink shared channel) transmission, the time domain resource assignment can be transmitted by information about the slot in which the PUSCH is transmitted, the start OFDM symbol position S in the slot, and the number of OFDM symbols L to which the PUSCH is mapped. The above S may be a relative position from the start of the slot, and L may be the number of consecutive OFDM symbols. S and L can be determined from the Start and Length Indicator Value (SLIV) defined as follows.

If(L-1)≦7 then
SLIV=14*(L-1)+S
else
SLIV=14*(14-L+1)+(14-1-S)
where 0<L≦14-S

In a 5G or NR system, a terminal can generally be configured with a table through RRC configuration, in which one row includes information on the SLIV value, PUSCH mapping type, and slot in which the PUSCH is transmitted. Thereafter, the base station can convey information on the SLIV value, PUSCH mapping type, and slot in which the PUSCH is transmitted to the terminal by indicating an index value in the table configured in the time domain resource allocation of the DCI. This method is also applicable to the PDSCH.

Specifically, when the base station indicates the time resource allocation field index m included in the DCI for scheduling the PDSCH to the terminal, this notifies the combination of DMRS (demodulation reference signal) Type A position information corresponding to m+1, PDSCH mapping type information, slot index K ₀ , data resource start symbol S, and data resource allocation length L in a table indicating time domain resource allocation information. For example, the following Table 3 is a table including normal cyclic prefix-based PDSCH time domain resource allocation information.

In Table 3, dmrs-typeA-Position is a field that indicates the symbol position where DMRS is transmitted in one slot indicated by SIB (System Information Block), which is one of the terminal common control information. The possible values of this field are 2 or 3. There are a total of 14 symbols constituting one slot, and when the first symbol index is 0, 2 means the third symbol and 3 means the fourth symbol. In Table 3, PDSCH mapping type is information that indicates the position of DMRS in the scheduled data resource region. When PDSCH mapping type is A, DMRS is always transmitted and received at the symbol position determined by dmrs-typeA-Position regardless of the assigned data time region resource. When PDSCH mapping type is B, in relation to the position of the DMRS, the DMRS is always transmitted and received at the first symbol position in the assigned data time domain resource. In other words, PDSCH mapping type B does not use dmrs-typeA-Position information.

In Table 1, _K0 means an offset between the slot index of the PDCCH (physical downlink control channel) to which the DCI is transmitted and the slot index of the PDSCH or PUSCH scheduled by the DCI. For example, if the slot index of the PDCCH is n, the slot index of the PDSCH or PUSCH to which the DCI of the PDCCH is scheduled is n+ _K0 . In Table 3, S means the start symbol index of the data time domain resource in one slot. The possible range of S values is 0 to 13 based on the normal cyclic prefix. In Table 1, L means the length of the data time domain resource period in one slot. The possible range of L values is 1 to 14.

In a 5G or NR system, the PUSCH mapping types are defined as type A and type B. In PUSCH mapping type A, the first OFDM symbol among the DMRS OFDM symbols is located in the second or third OFDM symbol in a slot. In PUSCH mapping type B, the first OFDM symbol among the DMRS OFDM symbols is located in the first OFDM symbol in the time domain resource allocated for PUSCH transmission. The above-mentioned PUSCH time domain resource allocation method can be similarly applied to PDSCH time domain resource allocation.

DCI can be transmitted on a downlink physical control channel PDCCH (or control information, which may be used interchangeably hereinafter) after undergoing channel coding and modification processes. In general, DCI is scrambled with a specific RNTI (Radio Network Temporary Identifier, or terminal identifier) for each terminal, a CRC (Cyclic Redundancy Check) is added, and the DCI is channel coded and then composed of an independent PDCCH and transmitted. The PDCCH is mapped to a control resource set (CORESET) configured in the terminal and transmitted.

Downlink data can be transmitted on the PDSCH, which is a physical channel for transmitting downlink data. The PDSCH can be transmitted after the control channel transmission period, and scheduling information such as a specific mapping position in the frequency domain and a modulation method is determined based on the DCI transmitted via the PDCCH.

Through the MCS in the control information constituting the DCI, the base station notifies the terminal of the modulation scheme applied to the PDSCH to be transmitted and the size of the data to be transmitted (Transport Block Size, TBS). In one embodiment, the MCS can be composed of 5 bits or more or less bits. The TBS corresponds to the size before channel coding for error correction is applied to the data to be transmitted by the base station.

In this disclosure, a transport block (TB) may include a MAC header, a MAC CE, one or more MAC SDUs (Service Data Units), and padding bits. Alternatively, a TB may indicate a unit of data to be transmitted in a physical layer in the MAC layer or a MAC PDU (Protocol Data Unit).

The modulation methods supported by 5G or NR systems are QPSK, 16QAM, 64QAM, and 256QAM, with the modulation orders (Qm) corresponding to 2, 4, 6, and 8, respectively. That is, in the case of QPSK modulation, 2 bits can be transmitted per symbol, in the case of 16QAM modulation, 4 bits can be transmitted per OFDM symbol, in the case of 64QAM modulation, 6 bits can be transmitted per symbol, and in the case of 256QAM modulation, 8 bits can be transmitted per symbol.

When the PDSCH is scheduled by the DCI, HARQ-ACK information indicating whether the decoding of the PDSCH is successful or unsuccessful is transmitted from the terminal to the base station via the PUCCH. Such HARQ-ACK information is transmitted in a slot indicated by the PDSCH-to-HARQ feedback timing indicator included in the DCI that schedules the PDSCH, and the values mapped to the 1- to 3-bit PDSCH-to-HARQ feedback timing indicators are set by an upper layer signal as shown in Table 4. When the PDSCH-to-HARQ feedback timing indicator indicates k, the terminal transmits HARQ-ACK information k slots after the slot n in which the PDSCH was transmitted, i.e., n+k slots.

If the PDSCH-to-HARQ feedback timing indicator is not included in the DCI format 1_1 for scheduling the PDSCH, the terminal transmits the HARQ-ACK information in slot n+k according to the k value set in the higher layer signaling. When the terminal transmits the HARQ-ACK information on the PUCCH, the terminal transmits it from the base station using the PUCCH resource determined based on the PUCCH resource indicator included in the DCI for scheduling the PDSCH. At this time, the ID of the PUCCH resource mapped to the PUCCH resource indicator can be set via higher layer signaling.

Figure 2 shows an example of allocating data for eMBB, URLLC, and mMTC in a time-frequency resource region in a 5G or NR system.

Referring to FIG. 2, data for eMBB, URLLC, and mMTC can be allocated in the entire system frequency band 200. When URLLC data (203, 205, 207) is generated and needs to be transmitted while eMBB data 201 and mMTC data 209 are allocated and transmitted in a specific frequency band, the transmitter can empty the portion already allocated with eMBB data 201 and mMTC data 209 or transmit the URLLC data (203, 205, 207) without transmitting it. Among the above-mentioned services, since it is necessary to reduce the delay time for URLLC, the URLLC data can be allocated to a portion of the resource allocated with eMBB or mMTC data and transmitted. When URLLC data is additionally allocated and transmitted in the resource allocated with eMBB data, the eMBB data may not be transmitted in the overlapping time-frequency resource, and therefore the transmission performance of the eMBB data may be degraded. That is, eMBB data transmission failure due to URLLC allocation may occur.

Figure 3 is a diagram explaining grant-free transmission and reception operations.

There are a first signal transmission/reception type in which the terminal receives downlink data according to information set only in the upper signal from the base station, and a second signal transmission/reception type in which the terminal receives downlink data according to transmission setting information indicated by the upper signal and L1 signal. In this disclosure, SPS, which is the second signal type for downlink data reception, means grant-free based PDSCH transmission in the downlink. DL SPS allows the terminal to receive grant-free based PDSCH transmission through the upper signal setting and additional setting information indicated by DCI.

DL SPS stands for Downlink Semi-persistent Scheduling, which is a method in which a base station transmits and receives down data information periodically based on higher signaling and configured information without specific down control information scheduling to a terminal. It can be applied to VoIP (voice over internet protocol) or periodically generated traffic situations. Alternatively, the resource configuration for DL SPS may be periodic, but the data actually generated may be aperiodic. In this case, the terminal does not know whether actual data is generated in the periodically configured resource, so it can perform the following two types of operations.
-Method 3-1: For a periodically configured DL SPS resource region, the terminal transmits HARQ-ACK information to the base station for an uplink resource region corresponding to the resource region for a demodulation/decoding result of received data. -Method 3-2: For a periodically configured DL SPS resource region, if the terminal has successfully detected at least a DMRS or data signal, the base station transmits HARQ-ACK information to the uplink resource region corresponding to the resource region for a demodulation/decoding result of received data. -Method 3-3: For a periodically configured DL SPS resource region, if the terminal has successfully decoded/decoded (i.e., generated ACK), the base station transmits HARQ-ACK information to the uplink resource region corresponding to the resource region for a demodulation/decoding result of received data.

In method 3-1, even if the base station does not actually transmit downlink data to the DL SPS resource region, the terminal always transmits HARQ-ACK information in the uplink resource region corresponding to the DL SPS resource region. In method 3-2, since it is not known when the base station will transmit data in the DL SPS resource region, the terminal can transmit HARQ-ACK information in a situation where it is known whether data is transmitted or received, such as when DMRS detection is successful or CRC detection is successful. In method 3-3, the terminal transmits HARQ-ACK information in the uplink resource region corresponding to the DL SPS resource region only when data demodulation/decoding is successful.

Of the above methods, the terminal can always support only one or more than one. One of the methods can be selected in the 3GPP standard or upper signal. For example, if the upper signal indicates method 3-1, the terminal can perform HARQ-ACK information for the DL SPS based on method 3-1. Alternatively, one method can be selected according to DL SPS upper configuration information. For example, if the transmission period in the DL SPS upper configuration information is n slots or more, the terminal can apply method 3-1, and vice versa. In this example, the transmission period is given as an example, but it can be fully applied according to the applied MCS table, DMRS configuration information, resource configuration information, etc.

The terminal receives downlink data in a downlink resource region set by higher level signaling.
The downlink resource region set by the higher signaling can be activated or released by L1 signaling.

3 shows the operation for DL SPS. The terminal sets the following DL SPS configuration information from an upper signal.
-Periodicity: DL SPS transmission period -nrofHARQ-Processes: Number of HARQ processes configured for DL SPS -n1PUCCH-AN: HARQ resource configuration information for DL SPS -mcs-Table: MCS table configuration information applied to DL SPS

In the present disclosure, the DL SPS configuration information can be set for each Pcell (primary cell) or Scell (secondary cell), and can also be set for each BWP. In addition, one or more DL SPS can be set for each BWP of a specific cell.

In FIG. 3, the terminal determines grant-free transmission/reception setting information 300 through receiving higher-level signals for DL SPS. DL SPS can transmit and receive data to and from the resource region 308 that is set after receiving DCI instructing activation 302, but cannot transmit and receive data to and from the resource region 306 before receiving the DCI. In addition, the terminal cannot receive data to and from the resource region 310 after receiving DCI instructing release 304.

The terminal validates the DL SPS assignment PDCCH if both of the following two conditions are met for SPS scheduling activation or release.
Condition 1: The CRC bits of the DCI format transmitted on the PDCCH are scrambled with the configured scheduling (CS)-RNTI set in higher signaling. Condition 2: The New Data Indicator (NDI) field for the activated transmission block is set to 0.

If some of the fields constituting the DCI format transmitted in the DL SPS assignment PDCCH are the same as those shown in the following [Table 5] or [Table 6], the terminal determines that the information in the DCI format is a valid activation or a valid release of DL SPS. For example, if the terminal detects a DCI format including the information shown in [Table 5], the terminal determines that DL SPS is activated. In another example, if the terminal detects a DCI format including the information shown in [Table 6], the terminal determines that DL SPS is released.

If some of the fields constituting the DCI format transmitted in the DL SPS assignment PDCCH are not the same as those presented in [Table 5] (special field configuration information for activating DL SPS) or [Table 6] (special field configuration information for releasing DL SPS), the terminal determines that the DCI format is detected with a mismatched CRC.

When the terminal receives a PDSCH without receiving a PDCCH or receives a PDCCH indicating an SPS PDSCH release, it generates a corresponding HARQ-ACK information bit. Furthermore, at least in Rel-15NR, the terminal is not expected to transmit HARQ-ACK information for more than one SPS PDSCH reception in one PUCCH resource. In other words, at least in Rel-15NR, the terminal includes only HARQ-ACK information for one SPS PDSCH reception in one PUCCH resource.

DL SPS can also be configured in the PCell and SCell. Parameters that can be configured by DL SPS upper signaling are as follows:
-Periodicity: DL SPS transmission periodicity -nrofHARQ-processes: number of HARQ processes that can be configured for DL SPS -n1PUCCH-AN: PUCCH HARQ resource for DL SPS, the base station configures resources in PUCCH format 0 or 1

The above [Tables 5] to [Table 6] are possible fields in a situation where only one DL SPS can be configured per cell and per BWP. In a situation where multiple DL SPSs are configured per cell and per BWP, the DCI field for activating (or deactivating) each DL SPS resource may change. This disclosure provides a method for resolving such a situation.

Not all DCI formats described in [Table 5] and [Table 6] in this disclosure are used to activate or deactivate DL SPS resources, respectively. For example, DCI format 1_0 and DCI format 1_1 used for scheduling PDSCH are used for activating DL SPS resources. For example, DCI format 1_0 used for scheduling PDSCH is used for deactivating DL SPS resources.

Figure 4 shows a method for setting a semi-static HARQ-ACK codebook in an NR system.

In a situation where the number of HARQ-ACK PUCCHs that a terminal can transmit in one slot is limited to one, when the terminal receives a semi-static HARQ-ACK codebook upper configuration, the terminal reports HARQ-ACK information for PDSCH reception or SPS PDSCH release in the HARQ-ACK codebook in a slot indicated by the value of the PDSCH-to-HARQ_feedback timing indicator in DCI format 1_0 or DCI format 1_1. The UE reports the HARQ-ACK information bit value in the HARQ-ACK codebook by NACK in a slot not indicated by the PDSCH-to-HARQ_feedback timing indicator field in DCI format 1_0 or DCI format 1_1. If the UE reports only HARQ-ACK information for one SPS PDSCH release or one PDSCH reception in the case of M _A,C for candidate PDSCH reception, and the report is scheduled by DCI format 1_0 including information indicating that the counter DAI field is 1 in the Pcell, the UE determines one HARQ-ACK codebook for the SPS PDSCH release or the PDSCH reception.

Otherwise, the HARQ-ACK codebook determination method described below will be followed.

If a set of PDSCH receiving candidates in a serving cell c is M _A,c , M _A,c can be obtained in the following [pseudo-code1] stage.

[pseudo-code1 start]
- Action 1: Initialize j to 0 and M _A,c to the joint set. Initialize k to 0, which is the HARQ-ACK transmission timing index.
- Operation 2: Set R to a set of each row in a table including slot information, starting symbol information, and number of symbols or length information to which PDSCH is mapped. When the PDSCH possible mapping symbol indicated by each value of R is set to the UL symbol according to the DL and UL settings set in the upper layer, the row is deleted from R.
- Operation 3-1: If the terminal can receive one PDSCH for unicast in one slot and R is not a co-set, add one to the set M _A,c .
- Operation 3-2: If the terminal can receive more than one PDSCH for unicast in one slot, count the number of PDSCHs that can be assigned to different symbols in the calculated R, and add the corresponding number to M _A,c .
- Action 4: Increase k by 1 and start again from action 2.
[End of pseudo-code1]

Taking the above-mentioned pseudo-code1 as an example in FIG. 4, in order to transmit HARQ-ACK PUCCH in slot #k (408), all slot candidates capable of PDSCH-to-HARQ-ACK timing that can indicate slot #k (408) are considered. In FIG. 4, it is assumed that HARQ-ACK transmission is possible in slot #k (408) due to the PDSCH-to-HARQ-ACK timing combination that is possible only for PDSCHs scheduled in slot #n (402), slot #n+1 (404), and slot #n+2 (406). Then, considering time domain resource setting information of PDSCHs that can be scheduled in slots 402, 404, and 406, and information informing whether the symbol in the slot is downlink or uplink, the maximum number of PDSCHs that can be scheduled per slot is derived. For example, if two PDSCHs can be scheduled at most in slot 402, three PDSCHs in slot 404, and two PDSCHs in slot 406, the maximum number of PDSCHs included in the HARQ-ACK codebook transmitted in slot 408 is seven in total. This is called the cardinality of the HARQ-ACK codebook.

The above operation 3-2 within a specific slot is described via the following [Table 7] (Default PDSCH time domain resource allocation A for normal CP).

Table 7 is a time resource allocation table in which a terminal operates by default before receiving time resource allocation by a separate RRC signal. For reference, in addition to the row index value being separately indicated by RRC, the PDSCH time resource allocation value is determined by dmrs-TypeA-Position, which is a terminal common RRC signal. In Table 7, the ending and order columns are values added separately for convenience of explanation and may not exist in reality. The ending column means the end symbol of the scheduled PDSCH, and the order column means the code position value located in a specific codebook in a quasi-static HARQ-ACK codebook. This table is applied to time resource allocation applied in DCI format 1_0 of the common search space of PDCCH.

The terminal performs the following operations to calculate the maximum number of non-overlapping PDSCHs in a particular slot and determine the HARQ-ACK codebook.

* Operation 1: Search for the PDSCH allocation value that is terminated first in the slot among all rows of the PDSCH time resource allocation table. In Table 7, it can be seen that row index 14 is terminated first. This is represented as 1 in the order column. And other row indexes that overlap with row index 14 by at least one symbol are represented as 1x in the order column.

*Operation 2: Then, search for the first completed PDSCH allocation value among the remaining row indexes that are not displayed in the Order column. In Table 7, this corresponds to the row with row index 7 and dmrs-TypeA-Position value 3. Then, other row indexes that overlap with this row index and at least one symbol are displayed as 2x in the Order column.

*Operation 3: Repeat operation 2 and increase the order value to display. For example, search for the first completed PDSCH allocation value among the row indexes not displayed in the order column in Table 7. In Table 7, this corresponds to the row with row index 6 and dmrs-TypeA-Position value 3. Then, other row indexes that overlap with this row index and at least one symbol are displayed as 3x in the order column.

* Operation 4: If order is displayed for all row indexes, the process ends. The size of the order is the maximum number of PDSCHs that can be scheduled without time overlap within the slot. Scheduling without time overlap means that different PDSCHs are scheduled in TDM.

In the order column of Table 7, the maximum value of order means the HARQ-ACK codebook size of the corresponding slot, and the order value means the HARQ-ACK codebook point where the HARQ-ACK feedback bit for the corresponding scheduled PDSCH is located. For example, row index 16 in Table 7 means that it is present at the second code position in a semi-static HARQ-ACK codebook with a size of 3. A terminal transmitting HARQ-ACK feedback can obtain M _A,c in [pseudo-code1] or [pseudo-code2] operation when a set of PDSCH reception candidate cases (occasion for candidates PDSCH receptions) in serving cell _{c is M A,} c. M _A,c can be used to determine the number of HARQ-ACK bits that the terminal must transmit. Specifically, a HARQ-ACK codebook can be constructed using the cardinality of the M _A,c set.

As another example, the items that must be considered for determining a semi-static HARQ-ACK codebook (or type 1 HARQ-ACK codebook) are as follows:

As another example, the pseudo-code for determining the HARQ-ACK codebook is as follows:

The position of the HARQ-ACK codebook including the HARQ-ACK information for the DCI indicating the DL SPS release in pseudo-code2 is based on the position where the DL SPS PDSCH is received. For example, if the starting symbol at which the DL SPS PDSCH is transmitted is 5 symbols long starting from the 4th OFDM symbol on a slot basis, the HARQ-ACK information including the DL SPS release indicating the release of the SPS is determined based on the PDSCH-to-HARQ-ACK timing indicator and the PUSCH resource indicator included in the control information indicating the DL SPS release, assuming that a PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot in which the DL SPS release is transmitted is mapped. In another example, if the starting symbol for transmitting the DL SPS PDSCH is 5 symbols long starting from the 4th OFDM symbol on a slot basis, the HARQ-ACK information including the DL SPS release instructing the release of the SPS is assumed to be mapped to a PDSCH having a length of 5 symbols starting from the 4th OFDM symbol of the slot indicated by the TDRA (Time Domain Resource Allocation) of the DCI, which is the DL SPS release, and the corresponding HARQ-ACK information is determined based on the PDSCH-to-HARQ-ACK timing indicator and the PUSCH resource indicator included in the control information indicating the DL SPS release.

Figure 5 shows a method for setting a dynamic HARQ-ACK codebook in an NR system.

The terminal transmits HARQ-ACK information to be transmitted in one PUCCH in slot n based on the PDSCH-to-HARQ_feedback timing value for PUCCH transmission of HARQ-ACK information in slot n for PDSCH reception or SPS PDSCH release and K0, which is transmission slot position information of the PDSCH scheduled in DCI format 1_0 or 1_1. Specifically, to transmit the above-mentioned HARQ-ACK information, the terminal determines the HARQ-ACK codebook of the PUCCH transmitted in the slot determined by the PDSCH-to-HARQ_feedback timing and K0 based on the DAI included in the DCI indicating the PDSCH or SPS PDSCH release.

The DAI consists of Counter DAI and Total DAI. Counter DAI is information that indicates the position in the HARQ-ACK codebook of HARQ-ACK information corresponding to PDSCH scheduled in DCI format 1_0 or DCI format 1_1. Specifically, the value of counter DAI in DCI format 1_0 or 1_1 indicates the accumulated value of PDSCH reception or SPS PDSCH release scheduled in a specific cell c according to DCI format 1_0 or DCI format 1_1. The above-mentioned accumulated value is set based on the PDCCH monitoring occasion in which the scheduled DCI exists and the serving cell.

Total DAI is a value that indicates the size of the HARQ-ACK codebook. Specifically, the value of Total DAI means the total number of PDSCH or SPS PDSCH releases scheduled before including the time when DCI is scheduled. And, Total DAI is a parameter used when HARQ-ACK information in serving cell c in a CA (Carrier Aggregation) situation also includes HARQ-ACK information for PDSCHs scheduled in other cells including serving cell c. In other words, there is no Total DAI parameter in a system operating in one cell.

An example of the operation for the DAI is shown in FIG. 5. In FIG. 5, when a terminal transmits a HARQ-ACK codebook selected based on the DAI in the nth slot of carrier 0 (502) to PUCCH 520 in a situation where two carriers are configured, changes in the values of Counter DAI (C-DAI) and Total DAI (T-DAI) indicated by the DCI searched for each PDCCH monitoring occasion configured for each carrier are shown. First, the DCI searched for m=0 (506) indicates that the C-DAI and T-DAI each have a value of 1 512. The DCI searched for m=1 (508) indicates that the C-DAI and T-DAI each have a value of 2 514. The DCI searched for in carrier 0 (c=0, 502) with m=2 (510) indicates a C-DAI value of 3 (516). The DCI searched for in carrier 1 (c=1, 504) with m=2 (510) indicates a C-DAI value of 4 (518). In this case, if carriers 0 and 1 are scheduled on the same monitoring occasion, the T-DAI is both indicated as 4.

In Figures 4 and 5, the HARQ-ACK codebook determination operates in a situation where only one PUCCH including HARQ-ACK information is transmitted in one slot. This is referred to as mode 1. As an example of a method for determining one PUCCH transmission resource in one slot, when PDSCHs scheduled with different DCIs are multiplexed and transmitted in one HARQ-ACK codebook in the same slot, the PUCCH resource selected for HARQ-ACK transmission is determined by the PUCCH resource indicated by the PUCCH resource field indicated in the DCI that last scheduled the PDSCH. That is, the PUCCH resource indicated by the PUCCH resource field indicated in the DCI scheduled before the DCI is ignored.

The following description defines a method and apparatus for determining a HARQ-ACK codebook in a situation where two or more PUCCHs including HARQ-ACK information can be transmitted in one slot. This is referred to as mode 2. A terminal can operate only in mode 1 (transmitting only one HARQ-ACK PUCCH in one slot) or only in mode 2 (transmitting one or more HARQ-ACK PUCCHs in one slot). Alternatively, for a terminal that supports both mode 1 and mode 2, the base station configures the terminal to operate in only one mode through upper signaling, or mode 1 and mode 2 are implicitly determined by the DCI format, RNTI, DCI specific field value, scrambling, etc. For example, the PDSCH scheduled in DCI format A and the HARQ-ACK information associated therewith are based on mode 1, and the PDSCH scheduled in DCI format B and the HARQ-ACK information associated therewith are based on mode 2.

Whether the HARQ-ACK codebook mentioned above is semi-static as shown in Figure 4 or dynamic as shown in Figure 5 is determined by the RRC signal.

Figure 6 shows the HARQ-ACK transmission process for DL SPS.

In FIG. 6, case 1 (600) shows a situation in which the maximum receivable PDSCH (602, 604, 606) is mapped in slot k without overlapping in terms of time resources. For example, if the DCI format for scheduling the PDSCH does not include a PDSCH-to-HARQ feedback timing indicator, the terminal transmits HARQ-ACK information 608 in slot k+l according to the l value set in the higher layer signaling. Therefore, the size of the semi-static HARQ-ACK codebook for slot k+l may be 3, which is the same as the number of the maximum transmittable PDSCHs in slot k. In addition, if the HARQ-ACK information is 1 bit for each PDSCH, the HARQ-ACK codebook 600 to 608 in FIG. 6 is composed of a total of 3 bits [X, Y, Z], where X is HARQ-ACK information for PDSCH 602, Y is HARQ-ACK information for PDSCH 604, and Z is HARQ-ACK information for PDSCH 606. If the PDSCH reception is successful, the information will be mapped to ACK, otherwise to NACK. In addition, if the DCI does not actually schedule the PDSCH, the terminal reports it as NACK. Specifically, the HARQ-ACK codebook position located according to the SLIV of the PDSCH that can be scheduled in the DCI can change and can be determined according to Table 7 or [pseudo code 1] or [pseudo code 2].

Case 2 (610) in FIG. 6 shows HARQ-ACK transmission when DL SPS is activated. In Rel-15NR, the minimum period of DL SPS is 10 ms, and in 610, the subcarrier spacing is 15 kHz and the length of one slot is 1 ms, so SPS PDSCH 612 is transmitted in slot n, and then SPS PDSCH 616 is transmitted in slot n+10.

The HARQ-ACK information for each SPS PDSCH notifies the period for the SPS, HARQ-ACK transmission resource information, MCS table setting, and the number of HARQ processes by the upper signal, and then notifies the frequency resource, time resource, MCS value, etc. according to the information included in the DCI format indicating the corresponding SPS activation. For reference, the PUCCH resource on which the HARQ-ACK information is transmitted can also be set by the upper signal, and the PUCCH resource has the following attributes.
- Hopping presence/absence - PUCCH format (start symbol, symbol length, etc.)

Here, the MCS table setting and HARQ-ACK transmission resource information may not exist. If HARQ-ACK transmission resource information exists, Rel-15NR supports PUCCH format 0 or 1, which can transmit up to 2 bits. However, in subsequent releases, PUCCH format 2, 3, or 4, which can transmit more than 2 bits, can also be fully supported.

Because the DL SPS upper signal configuration includes HARQ-ACK transmission resource information, the terminal can ignore the PUCCH resource indicator in the DCI format that indicates DL SPS activation. Or, the DCI format may not have a PUCCH resource indicator field at all. On the other hand, if the DL SPS upper signal configuration does not include HARQ-ACK transmission resource information, the terminal transmits HARQ-ACK information corresponding to DL SPS to the PUCCH resource determined in the PUCCH resource indicator of the DCI format that activates DL SPS. In addition, the difference between the slot in which the SPS PDSCH is transmitted and the slot in which the corresponding HARQ-ACK information is transmitted is determined by the value indicated by the PDSCH to HARQ-ACK feedback timing indicator of the format of the DCI for activating DL SPS, or if there is no indicator, it follows a specific value previously set by a higher signal. For example, as in case 2 (610) of FIG. 6, if the PDSCH to HARQ-ACK feedback timing indicator is 2, the HARQ-ACK information for the SPS PDSCH 612 transmitted in slot n is transmitted via the PUCCH 614 in slot n+2. In addition, the PUCCH in which the corresponding HARQ-ACK information is transmitted can be set in a higher signal or the corresponding resource can be determined by the L1 signal indicating DL SPS activation. And, the HARQ-ACK codebook position for the SPS PDSCH 612 transmitted to the PUCCH 614 is located at the Yth position in [X Y Z] if it is assumed that up to three PDSCHs can be received as shown in FIG. 6 600 and the time resource of the PDSCH 612 is the same as that of the PDSCH 604.

If a DCI indicating a DL SPS release is transmitted, the terminal must transmit HARQ-ACK information for the DCI to the base station. However, in the case of a semi-static HARQ-ACK codebook, the size and position of the HARQ-ACK codebook are determined by the time resource region to which the PDSCH is assigned and the slot interval between the PDSCH and the HARQ-ACK indicated by the L1 signal or the higher signal (PDSCH to HARQ-ACK feedback timing) as described above in this disclosure. Therefore, when transmitting a DCI indicating a DL SPS release to a semi-static HARQ-ACK codebook, a specific rule is required that does not arbitrarily determine the position in the HARQ-ACK codebook, and in Rel-15NR, the position of the HARQ-ACK information for the DCI indicating a DL SPS release is mapped in the same manner as the transmission resource region of the DL SPS PDSCH. For example, case 3 (620) in FIG. 6 shows a situation in which DCI 622 instructing the release of an activated DL SPS PDSCH is transmitted in slot n. If the PDSCH to HARQ-ACK feedback timing indicator included in the DCI 622 format indicates 2, HARQ-ACK information for the DCI 622 is transmitted to the PUCCH 623 in slot n+2, and the HARQ-ACK codebook position is assumed to be the same as if the SPS PDSCH already configured in slot n was scheduled, and the terminal maps and transmits HARQ-ACK information for DCI 622 instructing the release of DL SPS at the HARQ-ACK codebook position corresponding to the SPS PDSCH. In this regard, the following two methods are possible, and the base station and the terminal will transmit and receive the DCI in at least one method depending on the standard or base station configuration.

* Method 6-1-1: Transmit DCI to instruct DL SPS release only in slots where pre-configured SPS PDSCH is transmitted.

For example, as in case 3 (620) of FIG. 6, when the SPS PDSCH is configured to be transmitted in slot n, the terminal transmits DCI 622 instructing SPS PDSCH release only in slot n, and the slot in which the corresponding HARQ-ACK information is transmitted is the same as the slot position determined when it is assumed that the SPS PDSCH is transmitted. In other words, when the slot in which the HARQ-ACK information for the SPS PDSCH is transmitted is n+2, the slot in which the HARQ-ACK information for the DCI instructing DL SPS PDSCH release is transmitted is also n+2.

* Method 6-1-2: Sending DCI to indicate DL SPS release in any slot, regardless of the slot in which the SPS PDSCH is sent.

For example, as in case 3 (620) of FIG. 6, when the SPS PDSCH is transmitted in slots n, n+10, n+20, etc., the base station transmits DCI 624 instructing the release of the DL SPS PDSCH in slot n+3, and if the value indicated in the PDSCH to HARQ-ACK feedback timing indicator included in the DCI is 1 or the field is not present, if the value preset in the upper signal is 1, the HARQ-ACK information 626 for the DCI instructing the release of the DL SPS PDSCH is transmitted and received in slot n+4.

There may be cases where the minimum period of DL SPS is shorter than 10 ms. For example, if there is data that requires high reliability and low latency wirelessly for different equipment in a factory, and the transmission period of the data is constant and the period itself is short, it must currently be shorter than 10 ms. Therefore, regardless of the subcarrier interval, which is not in ms units, the DL SPS transmission period can be determined in slot units, symbol units, or symbol group units. For reference, the minimum transmission period of uplink configured grant PUSCH resources is 2 symbols.

Case 4 (630) in FIG. 6 shows a situation where the DL SPS transmission period is 7 symbols, which is less than a slot. Since the transmission period is within one slot, up to two SPS PDSCHs (632, 634) can be transmitted in slot k. In addition, the HARQ-ACK information corresponding to the SPS PDSCH 632 and the SPS PDSCH 634 is transmitted in a slot according to a value indicated by the PDSCH to HARQ-ACK feedback timing indicator included in the DCI indicating SPS activation, or if the corresponding field is not present, the HARQ-ACK information is transmitted in a slot according to a value previously set in the upper signal. For example, if the corresponding value is i, the terminal transmits HARQ-ACK information 636 for the SPS PDSCH 632 and the SPS PDSCH 634 in slot k+i. The position of the HARQ-ACK codebook included in the HARQ-ACK information must consider not only the TDRA, which is time resource information for which the SPS PDSCH is scheduled, but also the transmission period. If only one SPS PDSCH can be transmitted per slot, the HARQ-ACK codebook position is determined based on the TDRA, which is time resource information, without considering the transmission period. On the other hand, if the DL SPS transmission period is smaller than the slot, both the TDRA, which is time resource information, and the transmission period must be considered in order to determine the HARQ-ACK codebook position. Here, the TDRA includes the transmission start symbol and length information of the SPS PDSCH. For example, if the DL SPS transmission period is 7 symbols, and the start symbol of the DL SPS PDSCH determined by the TDRA is 2 and the length is 3, two DL SPS PDSCHs will exist in one slot as in case 4 (630) with a length of 6. That is, the first SPS PDSCH 632 is a PDSCH having OFDM symbol indexes 2, 3, and 4 determined by the TDRA, and the second SPS PDSCH 634 is a PDSCH having OFDM symbol indexes 9, 10, and 11 taking into account the TDRA and the transmission period of 7 symbols. That is, the second SPS PDSCH in the slot has the same length as the first SPS PDSCH, but the offset will be shifted by the transmission period. In summary, the quasi-static HAR
For generating or determining a HARQ-ACK codebook, the terminal uses time resource allocation information to determine the HARQ-ACK codebook position for the SPS PDSCH in one slot if the SPS PDSCH transmission period is greater than one slot, and takes into account both the time resource allocation information and the SPS PDSCH transmission period if the SPS PDSCH transmission period is less than one slot.

When the SPS PDSCH transmission period is smaller than one slot, the SPS PDSCH may cross a slot boundary depending on the combination of the transmission period and TDRA. Case 6 (650) in FIG. 6 shows this example, and in this case, the base station sets one SPS PDSCH that crosses the slot boundary to be repeatedly transmitted by dividing it into PDSCH 652 and PDSCH 654. In this case, PDSCH 652 and PDSCH 654 may always have the same length or different lengths. In addition, the terminal transmits only one HARQ-ACK information 656 for the SPS PDSCH composed of PDSCH 652 and PDSCH 654, and the reference slot is slot k+1 in which the last repeatedly transmitted PDSCH 654 was transmitted.

[Example 6-1: Semi-static HARQ-ACK codebook mapping method for DCI indicating DL SPS release]

When the transmission period of the SPS PDSCH is smaller than one slot, when the terminal transmits HARQ-ACK information for a DCI requesting the release of the SPS PDSCH based on a semi-static HARQ-ACK codebook, the terminal maps the HARQ-ACK codebook for the DCI by at least one of the following methods:

* Method 6-2-1: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is the same as the position of the HARQ-ACK codebook for the first SPS PDSCH in terms of time resources among the SPS PDSCHs received in one slot.

- If the number of SPS PDSCHs in a slot in which a DCI instructing the release of an SPS PDSCH is transmitted is two or more, the terminal maps the HARQ-ACK information for the DCI to the quasi-static HARQ-ACK codebook position for the HARQ-ACK information of the earliest SPS PDSCH in time and transmits it.

- For example, if the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception, including the SPS PDSCH, in a slot in which a DCI indicating the release of an SPS PDSCH is transmitted is four, the HARQ-ACK codebook size for that slot is four, and HARQ-ACK information for the SPS PDSCH or PDSCH reception will be mapped to each position, such as {1, 2, 3, 4}. If the HARQ-ACK information for two SPS PDSCHs is mapped to positions {2} and {3}, respectively, the HARQ-ACK information indicating the release of the DL SPS PDSCH will be mapped to position {2}.

* Method 6-2-2: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is the same as the position of the HARQ-ACK codebook for the SPS PDSCH that is located last in terms of time resources among the SPS PDSCHs received in one slot.

- If the number of SPS PDSCHs in a slot in which a DCI instructing the release of an SPS PDSCH is transmitted is two or more, the terminal maps the HARQ-ACK information for the DCI to the quasi-static HARQ-ACK codebook position for the HARQ-ACK information of the last SPS PDSCH in time and transmits it.

- For example, if the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception, including the SPS PDSCH, in a slot in which a DCI indicating the release of an SPS PDSCH is transmitted is four, the HARQ-ACK codebook size for that slot is four, and HARQ-ACK information for the SPS PDSCH or PDSCH reception will be mapped to each position, such as {1, 2, 3, 4}. If the HARQ-ACK information for two SPS PDSCHs is mapped to positions {2} and {3}, respectively, the HARQ-ACK information indicating the release of the DL SPS PDSCH will be mapped to position {3}.

* Method 6-2-3: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI indicating SPS PDSCH release is the same as the position of all HARQ-ACK codebooks for SPS PDSCH received in one slot.

- If the number of SPS PDSCHs in a slot in which a DCI indicating the release of an SPS PDSCH is transmitted is two or more, the terminal repeatedly maps the HARQ-ACK information for the DCI to the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of all SPS PDSCHs and transmits it.

- For example, if the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception, including the SPS PDSCH, in a slot in which a DCI indicating the release of the SPS PDSCH is transmitted is four, the size of the HARQ-ACK codebook for that slot is four, and the HARQ-ACK information for the SPS PDSCH or PDSCH reception will be mapped to each position, such as {1, 2, 3, 4}. If the HARQ-ACK information for two SPS PDSCHs is mapped to positions {2} and {3}, respectively, the HARQ-ACK information indicating the release of the DL SPS PDSCH is repeatedly mapped to positions {2} and {3}. That is, the same HARQ-ACK information is mapped to positions {2} and {3}.

* Method 6-2-4: The position of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI instructing SPS PDSCH release is selected by the base station from among multiple HARQ-ACK codebook candidate positions for SPS PDSCH received in one slot using a higher level signal, L1 signal, or a combination of both.

- If the number of SPS PDSCHs in a slot in which a DCI instructing the release of an SPS PDSCH is transmitted is two or more, the base station selects one of the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the SPS PDSCH using an upper signal, an L1 signal, or a combination of both, and the terminal maps and transmits the HARQ-ACK information for the DCI at the selected position.

- For example, if the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception, including the SPS PDSCH, in a slot in which a DCI instructing the release of an SPS PDSCH is transmitted, is 4, the HARQ-ACK codebook size for the slot is 4, and HARQ-ACK information for the SPS PDSCH or PDSCH reception will be mapped to each position, such as {1, 2, 3, 4}. If two SPS PDSCHs have their HARQ-ACK information mapped to positions {2} and {3}, respectively, the base station selects {2} using the DCI instructing the release of the DL SPS PDSCH, and the terminal maps and transmits HARQ-ACK information instructing the release of the DL SPS PDSCH. The DCI field for determining the quasi-static HARQ-ACK codebook position may utilize a time resource allocation field, a HARQ process number, a PDSCH-to-HARQ feedback timing indicator, etc. For example, a time resource allocation field in a DCI indicating an SPS PDSCH release indicates time resource information of one SPS PDSCH among SPS PDSCHs that can be transmitted in the corresponding slot, and the terminal may transmit the HARQ-ACK information of the DCI to the quasi-static HARQ-ACK codebook position corresponding to the indicated SPS PDSCH.

* Method 6-2-5: The location of the semi-static HARQ-ACK codebook for HARQ-ACK information for DCI instructing SPS PDSCH release is specified or set by the base station by the upper signal, L1 signal, or a combination of both.

-If the maximum number of PDSCHs that can be received without time overlapping in a slot in which a DCI indicating SPS PDSCH release is transmitted is two or more, the base station selects one position from the semi-static HARQ-ACK codebook positions for the HARQ-ACK information of the PDSCH using an upper signal, an L1 signal, or a combination of both, and the terminal maps and transmits the HARQ-ACK information for the DCI at the selected position.

- The set of semi-static HARQ-ACK codebook locations that the base station can select according to method 6-2-4 is composed of semi-static HARQ-ACK codebook locations to which the HARQ-ACK information of the SPS PDSCH can be mapped, and the set of semi-static HARQ-ACK codebook locations that the base station can select according to method 6-2-5 is composed of semi-static HARQ-ACK codebook locations to which the HARQ-ACK information of all PDSCHs can be mapped.

-For example, if the maximum number of PDSCHs that can be transmitted and received without simultaneous PDSCH reception, including the SPS PDSCH, in a slot in which a DCI instructing the release of the SPS PDSCH is transmitted, is 4, the size of the HARQ-ACK codebook for the slot is 4, and the HARQ-ACK information for the SPS PDSCH or PDSCH reception will be mapped to each position, such as {1, 2, 3, 4}. The base station selects {1} using the DCI instructing the release of the DL SPS PDSCH, and the terminal maps the HARQ-ACK information instructing the release of the DL SPS PDSCH to the {1} position and transmits it. The DCI field for determining the semi-static HARQ-ACK codebook position may be a time resource allocation field, a HARQ process number, a PDSCH-to-HARQ feedback timing indicator, or the like. For example, the time resource allocation field in the DCI indicating the SPS PDSCH release indicates the time resource information of one of the PDSCHs that can be transmitted in the slot, and the terminal transmits the HARQ-ACK information of the DCI to the semi-static HARQ-ACK codebook position corresponding to the indicated PDSCH.

The above method may be possible in a situation where only one HARQ-ACK transmission is supported in one slot. If a code block group (CBG)-based transmission is configured at a higher level via the DL SPS PDSCH, the terminal may repeat the HARQ-ACK information for the DCI instructing the release of the DL SPS PDSCH as many times as the number of CBGs and transmit it by mapping it to a semi-static HARQ-ACK codebook resource determined by at least one of the above methods. The above method is described as a method of transmitting HARQ-ACK information for a DL SPS PDSCH instructing the release of one SPS PDSCH transmission/reception, but it is also possible to transmit HARQ-ACK information for a DL SPS PDSCH instructing the simultaneous release of two or more activated DSCH transmission/receptions in one cell/one BWP without any modification. For example, if one DL SPS PDSCH release signal is associated with multiple SPS PDSCHs activated in one cell/one BWP, the SPS PDSCH considered for HARQ-ACK codebook location selection may be an SPS PDSCH belonging to a representative configuration or an SPS PDSCH belonging to all configurations. In this case, if it belongs to a representative configuration, the representative configuration may be the SPS PDSCH configuration number with the lowest index or the first activated SPS PDSCH configuration. This is merely an example, and other similar methods are fully possible.

[Example 6-2: Dynamic HARQ-ACK codebook mapping method for multiple SPS PDSCHs transmitted in one slot]

The position of the HARQ-ACK information in the dynamic HARQ-ACK codebook (or Type 2 HARQ-ACK codebook) is basically determined by the Total DAI and Counter DAI included in the DCI that schedules the PDSCH. The Total DAI indicates the size of the HARQ-ACK codebook transmitted in slot n, and the Counter DAI indicates the position of the HARQ-ACK codebook transmitted in slot n. Next, in Rel-15NR, the dynamic HARQ-ACK codebook is set by [pseudo-code3].

[Pseudo-code3] is applied when the transmission period of the SPS PDSCH is greater than one slot, and when the transmission period of the SPS PDSCH is less than one slot, the dynamic HARQ-ACK codebook will be determined by the following [pseudo-code4]. Alternatively, [pseudo-code4] can be generally applied regardless of the SPS PDSCH transmission period or the number of SPS PDSCHs activated in one cell/one BWP.

The value k, which is the number of SPS PDSCHs in one slot in the above-mentioned [pseudo-code4], may only apply to one SPS PDSCH setting in one cell/one BWP, or may include all SPS PDSCH settings if multiple SPS PDSCH settings are possible in one cell/one BWP.

The above [pseudo-code3] or [pseudo-code4] can be applied in a situation where HARQ-ACK information transmission is limited to a maximum of one per slot.

[Example 6-3: Individual HARQ-ACK transmission method for multiple SPS PDSCHs transmitted in one slot]

When the terminal is configured by the base station to transmit only one HARQ-ACK per slot and a DL SPS transmission period smaller than one slot by the upper signal, the HARQ-ACK information for the DL SPS PDSCH 632 and DL SPS PDSCH 634 received in slot k is transmitted in the PUCCH of slot k+i in advance in the upper signal or the L1 signal or a combination thereof, as in case 4 (630) of FIG. 6. For example, the terminal determines the granularity for the PDSCH to HARQ-ACK timing indicator in the DCI format indicating DL SPS activation at the slot level, and the base station provides the terminal with the difference between the slot index in which the DL SPS PDSCH is received and the slot index in which the HARQ-ACK information is transmitted, and the PUCCH resource in which the HARQ-ACK information is transmitted in the slot indicated by L1 is configured to the terminal by the upper signal. Case 4 (630) in FIG. 6 shows a situation in which PDSCH to HARQ-ACK timing indicates the i value. This value can be selected directly by the L1 signal or candidate values can be set by the higher-level signal, and one of these values can be selected by the L1 signal.

If the UE or the base station wants to separately transmit and receive HARQ-ACK information for DL SPS PDSCHs transmitted and received separately, the base station can set a DL SPS transmission period smaller than one slot and two or more HARQ-ACK transmissions per slot by using an upper signal. For example, as in case 7 (660) of FIG. 6, the UE can transmit HARQ-ACK information for SPS PDSCH 662 received in slot k via PUCCH 666 in slot k+i, and transmit HARQ-ACK information for SPS PDSCH 664 via PUCCH 668 in slot k+i. To enable this, for example, the terminal determines the granularity for the PDSCH to HARQ-ACK timing indicator in the DCI format indicating DL SPS activation at the symbol level, and this value means the total symbol length from the transmission end symbol (or transmission start symbol) of the SPS PDSCH to the transmission start symbol (or transmission end symbol) of the PUCCH in which the HARQ-ACK information is transmitted. In case 7 (660) of FIG. 6, when the end symbol of the SPS PDSCH 662 is s0 and the start symbol of the PUCCH 666 in which the HARQ-ACK information for the SPS PDSCH 662 is transmitted is s1, the value indicated by the PDSCH to HARQ-ACK timing indicator is "s1-s0", and this value is directly selected by the L1 signal or a candidate value is set by the upper signal, and one of these values can be determined by the L1 signal. Through this information, the terminal can determine the starting symbol of the PUCCH in which HARQ-ACK information for the SPS PDSCH is transmitted. Other PUCCH transmission information can be determined by the upper signal or L1 signal, or a combination thereof. If the PUCCH resource indicator in the L1 or upper signal of Rel-15 is used, the terminal can determine that the "starting symbol index" field in the value indicated by the indicator is not used. Alternatively, since the starting symbol in which the HARQ-ACK information is transmitted was previously provided through the PDSCH to HARQ-ACK timing indicator information, a new upper signal or L1 signal without the field, or a signal composed of a combination thereof, can be provided to the terminal. In summary, the UE may interpret the PDSCH to HARQ-ACK timing indicator field included in the DCI indicating SPS PDSCH activation differently depending on the SPS PDSCH transmission period.

- Method 6-3-1: Determine by slot level

- For example, if the transmission period of the SPS PDSCH is greater than one slot, the terminal determines the granularity of the PDSCH to HARQ-ACK timing indicator at the slot level.

- Method 6-3-2: Judging at the symbol level

- For example, if the transmission period of the SPS PDSCH is smaller than one slot, the terminal determines the granularity of the PDSCH to HARQ-ACK timing indicator at the symbol level.

[Example 6-4: DL SPS/CG (configured grant) period change method for non-periodic traffic]

The DL SPS transmission period supported by the base station may be in slot-level or symbol-level units. If the delay-time sensitive information of the equipment operated in the factory is generated periodically and the period is not a standard value or a multiple of a value supported by the 3GPP standard organization, the base station cannot set an effective DL SPS transmission period. For example, if a traffic pattern with a 2.5 symbol interval exists, the base station cannot assign only DL SPS with a transmission period of 2 symbols or 3 symbols. Therefore, there is a need to set a DL SPS transmission period with aperiodicity or to introduce a signal that dynamically changes the transmission period. The terminal can dynamically change the transmission period by at least one of the following methods.

* Method 6-4-1: DL SPS transmission period allocation method with aperiodicity

- The base station can set the DL SPS transmission period in a bitmap manner. For example, when bitmap information consisting of 10 bits is present in the upper signal, and when 1 indicates DL SPS transmission and 0 indicates DL SPS non-transmission, if the bit unit means slot unit, various patterns of DL SPS transmission period can be generated even if it is not a period for 10 slots. And, the pattern can be repeated in units of 10 slots. Or, the bitmap size and the interval indicated by the bit can be a slot, a symbol, or a symbol group. The information can be set independently in the upper signal, or the range of the transmission interval that each bit can indicate can be changed depending on the bitmap size. For example, when the bitmap size is 20, the time range indicated by each bit can be in units of 7 symbols, and when the bitmap size is 10, the time range indicated by each bit can be in units of slots.

- Or, in advance, the base station may set two or more DL SPS transmission periods in the upper signal and set the time difference for each consecutively transmitted DL SPS in a pattern. For example, a DL SPS transmission period having a 2 symbol interval and a 3 symbol interval may be determined for a 2.5 symbol traffic pattern. Table 8 below is a table for setting the non-periodic DL SPS transmission period. Z is a decimal having a value up to the first decimal point and has a relationship of X<Z<X+1. For example, when Z is 3.2, X has a value of 3. Gap1 means a symbol interval between the first SPS PDSCH resource and the subsequent second SPS PDSCH resource received by the terminal after receiving a DCI indicating SPS activation. Gap2 means a symbol interval between the second SPS PDSCH resource and the subsequent third SPS PDSCH resource. That is, Gap i means a symbol interval between the i-th SPS PDSCH resource and the i+1-th SPS PDSCH resource. Configuration is a parameter for selecting one of various patterns, and Table 8 shows configuration having a total of nine patterns. The parameter is provided to the terminal by an upper signal or an L1 signal, and the terminal can know the DL SPS PDSCH transmission periodicity pattern according to the value indicated by the parameter. In another example, one value of configuration may be implicitly determined according to the traffic generation periodicity value. For example, if there is a 2.3 symbol traffic pattern and the base station and the terminal transmit and receive the information according to the upper signal setting, the base station and the terminal may determine that configuration No. 3 is applied.

* Method 6-4-2: Dynamic DL SPS transmission period change method

- Method 6-4-2-1: Including transmission period information in DCI instructing DL SPS activation

The DCI includes a DL SPS transmission period value in the information. A set of candidate values for the transmission period is set in advance in the upper signal, and a specific value from the set is selected in the DCI. For example, in the DCI in which the transmission period is set to {1 slot, 2 slots} in the upper signal, 1 bit is generated for the transmission period field, and the 1 bit indicates whether the transmission period is 1 slot or 2 slots. That is, the number of DCI bits is determined by the set of transmission periods set in the upper signal, and when the number of sets is N, a total of ceil (log2(N)) bits are set in the DCI. The DCI corresponds to a non-fallback DCI such as DCI format 1_1, and even if there is no fallback DCI field such as DCI format 1_0, a fixed bit value and a period value associated with each bit value can be applied.

- Method 6-4-2-2: Using existing fields in the DCI format to indicate DL SPS activation 1

When one field in a DCI format indicating DL SPS activation indicates a specific value, the values of other fields are used to indicate a transmission period other than the previously indicated value. For example, when all bit values of a field indicating an HARQ process number indicate a value of "1", a field indicating time resource information can be used to indicate one DL SPS transmission period among a set of DL SPS transmission periods previously set by a higher signal.

- Method 6-4-2-3: Using existing fields in the DCI format to indicate DL SPS activation 2

In the case of a DCI format indicating DL SPS activation, a specific field in the DCI format itself may always indicate a transmission period, or a specific value of a specific field in the DCI format may indicate a transmission period. For example, when the time resource allocation field of the DCI format is verified as a format indicating SPS PDSCH activation, the base station determines that the time resource allocation field is used with a value indicating the transmission period of the SPS PDSCH, not a value indicating the start symbol and length of the existing SPS PDSCH.

- Method 6-4-2-4: Search space-based implicit transmission period information setting

The transmission period value is dynamically changed depending on the search space in which the DCI instructing DL SPS activation is transmitted. For example, the DCI instructing DL SPS activation transmitted to the common search space has a transmission period A value, and the DCI instructing DL SPS activation transmitted to the UE specific search space has a transmission period B value, so that the terminal can implicitly determine this. The transmission period A and transmission period B can be set in advance by the terminal using a higher level signal.

- Method 6-4-2-5: Setting implicit transmission period information based on DCI format

The transmission period value is dynamically changed depending on the DCI format instructing DL SPS activation. For example, the DCI instructing DL SPS activation transmitted in DCI format 1_0, which is a fallback DCI, has a transmission period A value, and the DCI instructing DL SPS activation transmitted in DCI format 1_1, which is a non-fallback DCI, has a transmission period B value, so that the terminal can implicitly determine this. The transmission period A and transmission period B can be set in advance by the terminal using an upper signal.

In this disclosure, the terminal does not expect DL SPS PDSCH time resource information to be set or indicated beyond the DL SPS transmission period, and if such setting or indication is made, the terminal shall regard it as an error and ignore it.

Figure 7 is a block diagram showing a process in which a terminal transmits semi-static HARQ-ACK codebook-based HARQ-ACK information for a DCI indicating SPS PDSCH deactivation.

The terminal receives SPS PDSCH setting information through an upper signal. At this time, the information set in the upper signal may include a transmission period, an MCS table, HARQ-ACK setting information, etc. After receiving the upper signal, the terminal receives a DCI for activating the SPS PDSCH from the base station (700). After receiving the DCI instructing the activation, the terminal periodically receives the SPS PDSCH and transmits corresponding HARQ-ACK information to the base station (702). Thereafter, if there is no more downlink data to be periodically transmitted or received, the base station transmits a DCI instructing the deactivation of the SPS PDSCH to the terminal, which the terminal receives (704). The terminal transmits HARQ-ACK information for the DCI instructing the deactivation of the SPS PDSCH according to the SPS PDSCH transmission period (706). For example, if the transmission period is greater than one slot, the terminal transmits HARQ-ACK information for the DCI instructing SPS PDSCH deactivation at the HARQ-ACK codebook position for HARQ-ACK information corresponding to the SPS PDSCH. The HARQ-ACK information may be transmitted by at least one of the above-described methods 6-1-1 and 6-1-2 of FIG. 6. If the transmission period is less than one slot, the terminal may transmit HARQ-ACK information for the DCI information instructing SPS PDSCH deactivation by at least one of the methods 6-2-1 to 6-2-5. The above description of FIG. 7 is an operation that is applied when the terminal is previously configured with a semi-static HARQ-ACK codebook from the base station by an upper signal. Also, the above description of FIG. 7 may be applied only when the terminal is previously configured to be able to transmit only one HARQ-ACK per slot by an upper signal or a standard or terminal capability.

Figure 8 is a block diagram showing how a terminal dynamically determines a HARQ-ACK codebook for receiving an SPS PDSCH.

If the terminal is previously configured to operate with a dynamic HARQ-ACK codebook by an upper signal, the terminal starts determining the HARQ-ACK codebook size for the HARQ-ACK information to be transmitted in a specific slot (800). The terminal not only determines the HARQ-ACK codebook size for the dynamically scheduled PDSCH, but also calculates the total number of SPS PDSCHs generated in the slot corresponding to the slot for transmitting the HARQ-ACK information and reflects this in the HARQ-ACK codebook size (802). The terminal can set the dynamic HARQ-ACK codebook by at least one of [pseudo-code3] or [pseudo-code4] described above in FIG. 6. Thereafter, the terminal ends the HARQ-ACK codebook size determination (804) and transmits the HARQ-ACK information to the base station in the corresponding slot. Also, the above description of FIG. 8 may be applied only when the UE is configured in advance to transmit only one HARQ-ACK per slot in the upper signal or the specification or the UE capability. For reference, when one SPS PDSCH is repeatedly transmitted across slot boundaries as in case 6 (650) of FIG. 6, the UE determines the HARQ-ACK codebook size based on the slot in which the SPS PDSCH is last repeatedly transmitted when determining the dynamic HARQ-ACK codebook. Specifically, in case 6 (650) of FIG. 6, the SPS PDSCH 652 is transmitted in slot k, but the UE does not calculate the number of valid SPS PDSCHs to determine the dynamic HARQ-ACK codebook size, but instead determines the dynamic HARQ-ACK codebook size for the SPS PDSCH 654 transmitted in slot k+1. In addition, in [pseudo-code4], when determining the number of SPS PDSCHs per slot (k) for dynamic HARQ-ACK codebook size determination in a specific slot, the number of valid SPS PDSCHs is calculated based on the slot (or the end slot) to which the end symbol of the last SPS PDSCH belongs among the repeatedly transmitted SPS PDSCHs.

Figure 9 is a block diagram showing a method for transmitting HARQ-ACK information based on the terminal's DL SPS transmission period.

The terminal receives information on the DL SPS transmission period or the maximum number of HARQ-ACK information transmissions per slot provided by an upper signal or an L1 signal (900). Then, the terminal checks the DL SPS transmission period and the HARQ-ACK information transmission conditions per slot (902). If condition 1 is satisfied, the terminal transmits first type HARQ-ACK information (904). If condition 2 is satisfied, the terminal transmits second type HARQ-ACK information (906). Condition 1 is at least one of the following.
- When the transmission period of DL SPS PDSCH is greater than one slot - When only a maximum of one HARQ-ACK transmission is possible per slot

Condition 2 is at least one of the following:
- When the transmission period of DL SPS PDSCH is smaller than one slot - When two or more HARQ-ACK transmissions are possible per slot

The above-mentioned first type HARQ-ACK information transmission includes the following fields in a DCI format indicating activation of DL SPS PDSCH:
- PDSCH to HARQ-ACK feedback timing indicator: indicates the slot in which the PDSCH is transmitted and the slot interval in which the HARQ-ACK information is transmitted in slot units. When one SPS PDSCH is repeatedly transmitted across a slot boundary as in case 6 (650) of Figure 6, the reference for the slot in which the PDSCH is transmitted is the slot of the last repeatedly transmitted SPS PDSCH.
-PUCCH resource indicator: number of symbols, starting symbol, PRB index, PUCCH format, etc.

Through this information, the terminal can set the PUCCH transmission resource and transmission format in which HARQ-ACK information for DL SPS PDSCH is transmitted. In addition, a set of values can be set in advance for the two field values by a higher signal, and one of these values is selected by the DCI.

The above-mentioned second type HARQ-ACK information transmission includes the following fields in a DCI format indicating activation of DL SPS PDSCH:
-PDSCH to HARQ-ACK feedback timing indicator: indicates the end symbol of PDSCH and the start symbol interval at which HARQ-ACK information is transmitted in symbol units -PUCCH resource indicator: number of symbols, PRB index, PUCCH format, etc.

Through this information, the terminal can set the PUCCH transmission resource and transmission format in which HARQ-ACK information for DL SPS PDSCH is transmitted. In addition, a set of values can be set in advance for the two field values by a higher signal, and one of these values is selected by the DCI.

Figure 10 is a block diagram showing simultaneous terminal operation for dynamically changing the DL SPS transmission period.

The terminal receives upper information of the SPS PDSCH including information such as a transmission period, an MCS table, and HARQ-ACK information. The terminal then receives a DCI instructing SPS PDSCH activation (1000). The terminal then transmits SPS PDSCH reception and corresponding HARQ-ACK information to the base station in a resource region determined by the upper signal and the L1 signal (1002). The terminal receives a DCI instructing SPS PDSCH modification information (1004). Here, the modification information may include an SPS PDSCH transmission period value in addition to an MCS value or a frequency and time resource region size. For reference, possible methods for modifying the SPS PDSCH transmission period include at least one of methods 6-4-1 to 6-4-2 described above in FIG. 6. After receiving the DCI, the terminal transmits SPS PDSCH reception and corresponding HARQ-ACK information to the base station with the modified information (1006). When the SPS PDSCH transmission period is changed by an upper signal or an L1 signal, if an SPS PDSCH occurs that exceeds a slot boundary that can be generated by the transmission period and the time resource region in which the SPS PDSCH is transmitted and received, the terminal can transmit and receive the SPS PDSCH by at least one of the following methods.

- Method 10-1: SPS PDSCH not yet transmitted/received

For example, if an SPS PDSCH is assigned to slot k and slot k+1 as shown in FIG. 650, the terminal considers the SPS PDSCH assigned in this manner to be erroneously set and does not receive it, and the corresponding HARQ-ACK information is not transmitted.

- Method 10-2: Repeatedly transmit and receive the SPS PDSCH by dividing it based on slot boundaries

For example, when the SPS PDSCH is assigned to slot k and slot k+1 as in case 6 (650) of FIG. 6, the terminal determines that the SPS PDSCH is repeatedly received in the form of SPS PDSCH 652 and SPS PDSCH 654. The terminal then transmits only one HARQ-ACK information for this based on the last SPS PDSCH 654.

- Method 10-3: Execute partial transmission and reception only in slots before the slot boundary for the SPS PDSCH

For example, when the SPS PDSCH is assigned to slot k and slot k+1 as in case 7 (650) of FIG. 6, the terminal determines that a valid SPS PDSCH is assigned only to the SPS PDSCH 652 and receives the SPS PDSCH. In other words, no transmission or reception is performed for the SPS PDSCH 654. Then, when the terminal transmits HARQ-ACK information, it transmits only one based on the SPS PDSCH 652.

- Method 10-4: Execute transmission/reception only for slots that cross the slot boundary for the SPS PDSCH.

For example, when the SPS PDSCH is assigned to slot k and slot k+1 as in case 6 (650) of FIG. 6, the terminal determines that a valid SPS PDSCH is assigned only to the SPS PDSCH 654 and receives the SPS PDSCH. In other words, no transmission or reception is performed for the SPS PDSCH 652. Then, when the terminal transmits HARQ-ACK information, it transmits only one based on the SPS PDSCH 654.

Figure 11 is a terminal operation diagram showing a method of transmitting HARQ-ACK information for an SPS release when two or more DL SPSs are activated.

If a terminal is capable of operating two or more activated DL SPS in one cell/one BWP, the base station can configure two or more DL SPS for one terminal. The reason for supporting two or more DL SPS settings is that when a terminal supports various traffic, different MCS or time/frequency resource allocation or period may be required for each traffic, so it would be advantageous to configure a DL SPS for each purpose.

The terminal receives the following higher level signal configuration information for DL SPS:
-Periodicity: DL SPS transmission period -nrofHARQ-Processes: number of HARQ processes configured for DL SPS -n1PUCCH-AN: HARQ resource configuration information for DL SPS -mcs-Table: MCS table configuration information applied to DL SPS -SPSindex: SPS index configured in one cell/one BWP

The SPS index in the upper signal configuration information can be used to notify which SPS the DCI (L1 signaling) providing SPS activation or deactivation indicates. Specifically, in a situation where two SPSs are configured by an upper signal in one cell/one BWP, the terminal needs index information in the SPS upper information to know which of the two SPSs the DCI instructing SPS activation indicates to activate. For example, the terminal can activate or deactivate the SPS through the HARQ process number field in the DCI instructing SPS activation or deactivation, which indicates the index of the specific SPS. Specifically, as shown in Table 9, if the DCI including the CRC scrambled with the CG-RNTI includes the following information and the NDI (New Data Indicator) field of the DCI indicates 0, the terminal determines that it indicates a PDSCH release (deactivation) of a specific SPS that has already been activated.

In Table 9, one HARQ process number may indicate one SPS index or multiple SPS indexes. In addition to the HARQ process number field, one or multiple SPS indexes may be indicated by other DCI fields (time resource field, frequency resource field, MCS, RV, PDSCH-to-HARQ timing field, etc.). Basically, one SPS can be activated or deactivated by one DCI. The location of the type 1 HARQ-ACK codebook for HARQ-ACK information for a DCI indicating an SPS PDSCH release is the same as the location of the type 1 HARQ-ACK codebook corresponding to the reception position of the corresponding SPS PDSCH. When the position of the HARQ-ACK codebook corresponding to the candidate SPS PDSCH reception in a slot is k ₁ , the position of the HARQ-ACK codebook for the DCI indicating the release of the SPS PDSCH is also k _1. Therefore, when a DCI indicating the SPS PDSCH release is transmitted in slot k, the terminal does not expect the PDSCH corresponding to the HARQ-ACK codebook position k ₁ to be scheduled in the same slot k, and when such a situation occurs, the terminal regards it as an error case.

Table 9 above lists DCI format 0_0 and 1_0 as examples, but it can also be applied to DCI format 0_1 and 1_1, and can be fully extended to apply to other DCI formats 0_x and 1_x.

Through the above-mentioned operation, the terminal can simultaneously operate one or more SPS PDSCHs in one cell/one BWP (1100) by receiving the SPS PDSCH upper signal and the DCI instructing the activation of the SPS PDSCH. Thereafter, the terminal periodically receives the activated SPS PDSCH in one cell/one BWP and transmits the corresponding HARQ-ACK information to the base station (1102). The terminal determines the HARQ-ACK information corresponding to the SPS PDSCH based on the slot interval information and the n1 PUCCH-AN information included in the SPS upper configuration information according to the PDSCH-to-HARQ-ACK timing included in the activated DCI information, based on the accurate time and frequency information and PUCCH format information within the slot. If the PDSCH-to-HARQ-ACK timing field included in the DCI information is not present, the terminal assumes that one value previously set in the upper signal is a default value and determines that the corresponding value has been applied.

When a Type 1 HARQ-ACK codebook is configured and the terminal receives a DCI instructing the deactivation (or release) of one SPS PDSCH (1104), the terminal transmits HARQ-ACK information by including the HARQ-ACK codebook position for the HARQ-ACK information for the DCI in the HARQ-ACK codebook position corresponding to the SPS PDSCH reception. If one DCI instructs the deactivation of two or more SPS PDSCHs, a problem may arise in which HARQ-ACK codebook position the terminal must transmit the HARQ-ACK information for the DCI. To solve this problem, the terminal transmits HARQ-ACK using at least one of the following methods (1106).

* Method a-1: Lowest index (or highest index)

In this method, when two or more SPS PDSCHs are deactivated by a DCI instructing deactivation, the HARQ-ACK information corresponding to the DCI instructing deactivation is included in the HARQ-ACK codebook position corresponding to the SPS PDSCH reception having the smallest (or highest or intermediate) value among the indices of the SPS PDSCHs. For example, when SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, the terminal transmits the HARQ-ACK information for the DCI in the HARQ-ACK codebook position corresponding to SPS PDSCH index 1 (or 5).

* Method a-2: Earliest HARQ-ACK codebook occasion (latest HARQ-ACK codebook occasion)

In this method, when two or more SPS PDSCHs are deactivated by a DCI indicating deactivation, HARQ-ACK information corresponding to the DCI indicating deactivation is included in the HARQ-ACK codebook located at the earliest (or latest) among the HARQ-ACK codebook positions of the SPS PDSCHs. For example, in a situation where SPS PDSCH index 1, SPS PDSCH index 4, and SPS PDSCH index 5 are simultaneously deactivated by one DCI, if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index 1 is _k1 , if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index 2 is _k2 , and if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index 3 is _k3 , where _k1 < _k2 < _k3 , the UE transmits the HARQ-ACK information corresponding to the DCI in _k1 (or _k3 ). If the positions of the HARQ-ACK codebooks for PDSCH reception of two or more SPS PDSCHs are the same, the UE regards them as one and performs the above operation.

* Method a-3: All HARQ-ACK codebook occasions

In this method, when two or more SPS PDSCHs are deactivated by a DCI instructing deactivation, instead of selecting a HARQ-ACK codebook position according to the above-mentioned method a-1 or a-2, the HARQ-ACK information for the DCI is included and transmitted in all HARQ-ACK codebook positions. For example, when SPS PDSCH index1, SPS PDSCH index4, and SPS PDSCH index5 are simultaneously deactivated by one DCI, the UE includes and transmits HARQ-ACK information for the DCI in HARQ-ACK codebook positions corresponding to SPS PDSCH indexes 1, 4, and 5. If at least two or more HARQ-ACK codebook positions of the SPS PDSCHs are the same, the UE regards them as one and transmits HARQ-ACK information. In another example, in a situation where SPS PDSCH index1, SPS PDSCH index4, and SPS PDSCH index5 are simultaneously deactivated by one DCI, if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index1 is _k1 , if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index2 is _k2 , and if the HARQ-ACK codebook position corresponding to the PDSCH reception of SPS PDSCH index3 is _k3 , where k1<k2<k3, the UE transmits HARQ-ACK information corresponding to the DCI included in _k1 , _K2 , and _k3 . If the positions of the HARQ-ACK codebooks for PDSCH reception of two or more SPS PDSCHs are the same, the UE regards them as one and performs the above operation.

* Method a-4: gNB configuration

This method means that the base station determines the above-mentioned methods a-1 to a-3 using an upper signal. Second, in addition to the above methods a-1 to a-3, the base station can directly determine the HARQ-ACK codebook position using an upper signal or an L1 signal. In this case, the HARQ-ACK codebook position that the base station can determine can be determined by the upper signal or the L1 signal from among the possible candidate HARQ-ACK codebook position candidates of the SPS PDSCH when two or more SPS PDSCHs are deactivated by one DCI, or the HARQ-ACK codebook position can be determined by the upper signal or the L1 signal regardless of this.

When the terminal receives a DCI instructing the release or deactivation of one or more SPS PDSCHs, the terminal does not expect that the HARQ-ACK codebook position transmitting the HARQ-ACK information for the DCI and the HARQ-ACK codebook position transmitting the HARQ-ACK information for the PDSCH scheduled by a different DCI will be identical to each other. If such scheduling is received, the terminal regards it as an error case and performs any operation.

Figure 12 is a block diagram of grant-free operation when one terminal is connected to two or more TRPs (Transmission and Reception Points).

The terminal may transmit and receive data with multiple TRPs (1200). Here, the term TRP may be used interchangeably with the term base station or BS (Base Station). In this situation, the terminal receives a signal instructing grant-free activation from one or more TRPs (1202). At this time, the signal may be an upper signal or an L1 signal. After receiving the signal instructing activation information, the terminal transmits or receives data with one or more TRPs and grant-free resources (1204). Furthermore, the terminal may receive one or more grant-free resource configurations within one cell and one BWP. Then, the terminal receives a signal instructing grant-free deactivation/cancellation from one or more TRPs (1206). At this time, the signal may be an upper signal or an L1 signal. The terminal transmits a response signal to the signal (1208). For example, if grant-free is SPS, the signal is DCI, and in this case, the terminal transmits HARQ-ACK information for the DCI. In another example, if grant-free is configured grant type 2, the signal is DCI, and in this case, the terminal transmits response information for the DCI in MAC CE as confirmation information to the TRP.

In the operation of grant-free, there are configured grant type 1 and configured grant type 2 in the uplink, and SPS in the downlink. In configured grant type 1, configured grant resources are set and activated/deactivated by the upper signal, and in configured grant type 2, some resource setting information is transmitted through the upper signal, and the remaining configured grant resources are set and activated/deactivated through DCI (L1 signal). In this description, for convenience, both are described as grant-free. In a situation where two or more grant-free settings are possible within one cell and one BWP, when a terminal can transmit and receive data with two or more TRPs, one grant-free resource can be linked to one TRP to transmit and receive data. For example, when grant-free resource A is set, the terminal determines that the grant-free resource is associated with TRP1 and receives or transmits data using the periodic grant-free resource with TRP1.

Specifically, in the case of configured grant type 1, the configured grant resource is set and activated/deactivated only by the upper signal without the L1 signal, so the upper signal information may include information notifying which TRP the configured grant is transmitted from. For example, the following parameters may be present in the upper information for the configured grant type.

*TRP index (or spatial domain information): TRP information linked to configured grant.

One or more TRPs can be associated with one configured grant. Specifically, when multiple TRPs are associated with a configured grant, the following situation can be detailed.

* Situation b-1: Associated with different TRPs for each specific configured grant resource. In one example, when one configured grant resource is set periodically and a terminal is connected to two TRPs, odd-numbered configured grants can be associated with TRP1 and even-numbered configured grants can be associated with TRP2 from the time the configured grant is activated. Generalizing this, the TRP associated with each specific configured grant can be determined by a modification such as "configured grant index" mod "TRP number" = "TRP index".

* Situation b-2: Each configured grant resource is associated with two or more TRPs. The terminal can send data to multiple TRPs depending on the configured grant occasion.

*Situation b-3: A transmission period is determined for each TRP regardless of the configured grant index, and a specific configured grant can be associated with one TRP, and another configured grant can be associated with multiple TRPs. For example, when a terminal is connected to two TRPs, TRP1 is associated with all configured grant resources and TRP2 is associated with an even-numbered configured grant resource, if data is generated by the terminal, the odd-numbered configured grant resource transmits data only to TRP1, and if data is generated by the terminal for TRP1 and TRP2, the even-numbered configured grant resource transmits data to the corresponding resource.

The above situation is applicable to all grant-free operations including SPS. The information that one grant-free resource is associated with multiple TRPs can be set by an upper or L1 signal. In the case of SPS, after the terminal receives the setting information and activation information of configured grant type 1, if data is generated in the configured grant resource set for the TRP indicated in the TRP index, the terminal transmits the data without a separate grant.

In the case of configured grant type 2, some information is transmitted by the upper signal, and the remaining configuration information and activation/deactivation are instructed by the L1 signal. If the upper signal includes the TRP index information, the terminal transmits the data without a separate grant if there is data to be transmitted to the configured grant resource for the TRP specified by the TRP index provided in the upper configuration information after receiving the L1 signal instructing the activation of configured grant type 2 according to the information. On the other hand, if the upper configuration information does not include information on the TRP index, the terminal implicitly determines the TRP to transmit data to the resource configured in the configured grant according to the TRP associated with the CORESET in which the DCI instructing the activation of configured grant type 2 is transmitted. For example, when a CORESET in which a DCI instructing the activation of configured grant type 2 is transmitted is transmitted from TRP1, if data is generated for the activated configured grant resource, the terminal transmits the data to TRP1 without a separate grant. At least one of the following two methods is used for the TRP in which a DCI instructing the deactivation of configured grant type 2 is transmitted.

*Method b-1: For configured grant resources associated with TRP1, only the DCI sent in the CORESET of TRP1 can instruct the release of the configured grant. If one DCI supports simultaneous release of two or more configured grant resources, according to this method, all of the two or more configured grants must be associated with TRP1.

*Method b-2: Unlike Method 1, a DCI sent in a CORESET associated with a TRP other than TRP1 can also instruct the release of the configured grant. If one DCI supports simultaneous release of two or more configured grant resources, according to this method, the two or more configured grants can each be associated with a different TRP.

In the case of SPS, the detailed operation is mostly similar to the above-mentioned configured grant type 2, except that the terminal receives data for the activated SPS resource and reports HARQ-ACK information for the data. If the SPS resource is associated with TRP1, the terminal transmits HARQ-ACK information for the data received on the SPS resource to TRP1. If the SPS resource is associated with two or more TRPs, the TRP from which the terminal transmits HARQ-ACK information can be determined according to the above-mentioned situation. If a specific SPS resource is received from TRP1 in one SPS setting, the terminal transmits HARQ-ACK information for the PDSCH received from the SPS to TRP1. If a specific SPS resource is received from TRP1 and TRP2 in one SPS configuration, the terminal transmits HARQ-ACK information for the PDSCH received from the SPS on TRP1 or TRP2 according to the upper signal configuration or L1 signal instruction. Alternatively, if a specific SPS resource is received from TRP1 and TRP2 in one SPS configuration, the terminal transmits HARQ-ACK information for the PDSCH received from the SPS on TRP1 with the lowest index (or TRP1 if TRP1 is the master TRP).

In another example, when a DCI instructing activation of configured grant type 2 or SPS is sent to a CORESET associated with TRP1, the TRP associated with configured grant type 2 or SPS may be a TRP other than TRP1. Specifically, the terminal can perform the above operation when it determines TRP association information for configured grant type 2 or SPS in advance in an upper signal. Alternatively, a field that directly indicates TRP information may be added to the DCI information instructing activation, or the TRP information may be indirectly indicated using a HARQ process number or RV value in the DCI.

In another example, when different grant-free resources associated with one TRP overlap, the terminal must select one of them and transmit or receive data through the grant-free resource. In this case, when the terminal implements the selection method or the grant-free resource, a priority value is transmitted by an upper signal setting or an L1 signal instruction, and the terminal can transmit or receive data through the grant-free resource with the highest priority based on the priority value. If different grant-free resources associated with different TRPs overlap, the terminal can transmit or receive data through the grant-free resource without applying the selection method.

Figure 13 is a block diagram showing the structure of a terminal capable of implementing an embodiment of the present disclosure.

Referring to FIG. 13, the terminal of the present disclosure may include a terminal receiver 1300, a terminal transmitter 1304, and a terminal processor 1302. The terminal receiver 1300 and the terminal transmitter 1304 may be commonly referred to as a transceiver in the embodiment. The transceiver may transmit and receive signals to and from a base station. The signals may include control information and data. To this end, the transceiver may be composed of an RF transmitter that upconverts and amplifies the frequency of a signal to be transmitted, and an RF receiver that low-noise amplifies a received signal and downconverts the frequency. Furthermore, the transceiver may receive a signal via a wireless channel and output it to the terminal processor 1302, and transmit the signal output from the terminal processor 1302 via a wireless channel. The terminal processor 1302 may control a series of processes so that the terminal operates according to the above-mentioned embodiment.

Figure 14 is a block diagram showing the structure of a base station capable of implementing an embodiment of the present disclosure.

Referring to FIG. 14, in the embodiment, the base station may include at least one of a base station receiving unit 1401, a base station transmitting unit 1405, and a base station processing unit 1403. The base station receiving unit 1401 and the base station transmitting unit 1405 may be commonly referred to as a transceiver in the embodiment of the present disclosure. The transceiver may transmit and receive signals to and from a terminal. The signals may include control information and data. To this end, the transceiver may be composed of an RF transmitter that upconverts and amplifies the frequency of a signal to be transmitted, an RF receiver that low-noise amplifies a received signal and downconverts the frequency, and the like. Furthermore, the transceiver may receive a signal via a wireless channel and output it to the base station processing unit 1403, and transmit the signal output from the terminal processing unit 1403 via a wireless channel. The base station processing unit 1403 may control a series of processes so that the base station operates according to the embodiment of the present disclosure described above.

Meanwhile, in the drawings illustrating the method of the present disclosure, the illustrated steps do not necessarily correspond to the steps of execution, and the order of steps may be changed or the steps may be executed in parallel. Alternatively, the drawings illustrating the method of the present disclosure may omit some components and include only some components within the scope that does not detract from the essence of the present disclosure.

This disclosure mainly describes terminal operation for SPS PDSCH, but it is also fully possible to apply it equally to grant-free PUSCH (or configured grant type 1 and type 2).

In addition, the method of the present disclosure may be implemented by combining some or all of the contents contained in each embodiment within the scope that does not detract from the essence of the disclosure.

Meanwhile, the embodiments of the present disclosure disclosed in this specification and drawings are presented as specific examples to easily explain the contents of the present disclosure and to aid in the understanding of the present disclosure, and are not intended to limit the scope of the present disclosure. In other words, it is obvious to a person having ordinary skill in the art to which the present disclosure pertains that other variations based on the technical ideas of the present disclosure can be implemented. Furthermore, the respective embodiments can be operated in combination with each other as necessary. For example, a base station and a terminal can be operated by combining parts of multiple embodiments of the present disclosure with each other. Furthermore, although the above embodiments have been presented based on the NR system, other variations based on the technical ideas of the above embodiments may be implemented in other systems such as FDD or TDD LTE systems.

Although the present disclosure has been described with reference to various embodiments, those skilled in the art will recognize that various changes in form and detail may be made without departing from the spirit and scope of the present disclosure, as follows. The scope of the present disclosure is defined by the appended claims and their equivalents.

1300 Terminal receiving unit 1302 Terminal processing unit 1304 Terminal transmitting unit 1401 Base station receiving unit 1403 Base station processing unit 1405 Base station transmitting unit

Claims (15)

1. A method performed by a terminal in a communication system, comprising:
receiving, from a base station , a single downlink control information (DCI) format indicating a release of multiple semi persistent scheduling (SPS) physical downlink shared channel (PDSCH);
obtaining a hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook including hybrid automatic repeat request acknowledgment (HARQ-ACK) information corresponding to the plurality of SPS PDSCHs indicated by the single DCI format ;
transmitting the HARQ-ACK codebook to the base station;
The method , characterized in that the position of the HARQ-ACK information in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS configuration index among the plurality of SPS PDSCH releases. 2. The method of claim 1, further comprising receiving a radio resource control (RRC) message from the base station, the RRC message including information for setting the HARQ-ACK codebook to semi-static. The release of the multiple SPS PDSCHs is indicated based on a value of a HARQ process number field in the single DCI format;
2. The method of claim 1, wherein the single DCI format is determined to be a valid release when a cyclic redundancy check (CRC) of the single DCI format is scrambled with a configured scheduling radio network temporary identifier (CS-RNTI), a new data indicator (NDI) field in the single DCI format is set to 0, or a redundancy version (RV) field, a modulation and coding scheme (MCS) field, and a frequency domain resource assignment (FDRA) field correspond to previously set values, respectively . The method comprises:
receiving a plurality of SPS PDSCH configurations from the base station, the plurality of SPS PDSCH configurations including an SPS configuration index;
receiving, from the base station, a plurality of DCI formats each indicating an activation of an SPS PDSCH corresponding to the SPS configuration index;
The method of claim 1, wherein the HARQ-ACK codebook is transmitted to the base station on a physical uplink control channel (PUCCH). 1. A method performed by a base station in a communication system, comprising:
transmitting a single downlink control information (DCI) format to the terminal to instruct the terminal to release multiple semi persistent scheduling (SPS) physical downlink shared channels (PDSCHs);
receiving, from the terminal, a hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook including hybrid automatic repeat request acknowledgment (HARQ-ACK) information corresponding to the multiple SPS PDSCH releases indicated by the single DCI format ;
The method , characterized in that the position of the HARQ-ACK information in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS configuration index among the plurality of SPS PDSCH releases. The method of claim 5, further comprising transmitting, to the terminal, a radio resource control (RRC) message including information for setting the HARQ-ACK codebook to semi-static. The release of the multiple SPS PDSCHs is indicated based on a value of a HARQ process number field in the single DCI format ;
If the cyclic redundancy check (CRC) of the single DCI format is scrambled with a configured scheduling radio network temporary identifier (CS-RNTI), or the new data indicator (NDI) field in the single DCI format is set to 0, or the redundancy version (RV) field, the modulation and coding scheme (MCS) field, and the frequency domain resource assignment (FDRA) field correspond to previously set values, respectively , the single DCI format is determined to be a valid release;
The method comprises:
transmitting a plurality of SPS PDSCH configurations to the terminal, the plurality of SPS PDSCH configurations including an SPS configuration index;
transmitting, to the terminal, a plurality of DCI formats each indicating activation of an SPS PDSCH corresponding to the SPS configuration index;
The method of claim 5 , wherein the HARQ-ACK codebook is received from the terminal via a physical uplink control channel (PUCCH). A terminal of a communication system,
A transmitter/ receiver unit;
a control unit coupled to the transceiver unit ,
The control unit is
Receive a single downlink control information (DCI) format from a base station to indicate release of multiple semi persistent scheduling (SPS) physical downlink shared channels (PDSCHs);
Obtaining a hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook including hybrid automatic repeat request acknowledgment (HARQ-ACK) information corresponding to the multiple SPS PDSCH releases indicated by the single DCI format;
configured to transmit the HARQ-ACK codebook to the base station;
The position of the HARQ-ACK information in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS configuration index among the plurality of SPS PDSCH releases.
Terminal. The terminal of claim 8, wherein the controller is further configured to receive, from the base station, a radio resource control (RRC) message including information for setting the HARQ-ACK codebook to semi-static. The release of the multiple SPS PDSCHs is indicated based on a value of a HARQ process number field in the single DCI format;
10. The terminal of claim 8, wherein the single DCI format is determined to be a valid release when a cyclic redundancy check (CRC) of the single DCI format is scrambled with a configured scheduling radio network temporary identifier (CS-RNTI), a new data indicator (NDI) field in the single DCI format is set to 0, or a redundancy version (RV) field, a modulation and coding scheme (MCS) field, and a frequency domain resource assignment (FDRA) field correspond to previously set values, respectively . The control unit is
receiving a plurality of SPS PDSCH configurations from the base station, the plurality of SPS PDSCH configurations including an SPS configuration index;
configured to receive from the base station a plurality of DCI formats each indicating activation of an SPS PDSCH corresponding to the SPS configuration index;
The terminal according to claim 8 , wherein the HARQ-ACK codebook is transmitted to the base station on a physical uplink control channel (PUCCH). 1. A base station for a communication system, comprising:
A transmitter/ receiver unit;
a control unit coupled to the transceiver unit ,
The control unit is
Transmitting a single downlink control information (DCI) format to the terminal to instruct the release of multiple semi persistent scheduling (SPS) physical downlink shared channels (PDSCHs);
The terminal is configured to receive, from the terminal , a hybrid automatic repeat request acknowledgment (HARQ-ACK) codebook including HARQ-ACK information corresponding to the multiple SPS PDSCH releases indicated by the single DCI format;
The base station is characterized in that the position of the HARQ-ACK information in the HARQ-ACK codebook is the same as the position corresponding to the SPS PDSCH reception of the lowest SPS configuration index among the plurality of SPS PDSCH releases. 13. The base station of claim 12, wherein the controller is further configured to transmit, to the terminal, a radio resource control (RRC) message including information for setting the HARQ-ACK codebook to semi-static. The release of the multiple SPS PDSCHs is indicated based on a value of a HARQ process number field in the single DCI format;
13. The base station of claim 12, wherein the single DCI format is determined to be a valid release when a cyclic redundancy check (CRC) of the single DCI format is scrambled with a configured scheduling radio network temporary identifier (CS-RNTI), a new data indicator (NDI) field in the single DCI format is set to 0, or a redundancy version (RV) field, a modulation and coding scheme (MCS) field, and a frequency domain resource assignment (FDRA) field correspond to previously set values, respectively . The control unit is
Send a plurality of SPS PDSCH configurations to the terminal, the plurality of SPS PDSCH configurations including an SPS configuration index;
The terminal is configured to transmit a plurality of DCI formats each instructing activation of an SPS PDSCH corresponding to the SPS configuration index;
The base station of claim 12 , wherein the HARQ-ACK codebook is received from the terminal via a physical uplink control channel (PUCCH).

Images